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This is a searchable collection of scientific photos, illustrations, and videos. The images and videos in this gallery are licensed under Creative Commons Attribution Non-Commercial ShareAlike 3.0. This license lets you remix, tweak, and build upon this work non-commercially, as long as you credit and license your new creations under identical terms.

CRISPR

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RNA incorporated into the CRISPR surveillance complex is positioned to scan across foreign DNA. Cryo-EM density from a 3Å reconstruction is shown as a yellow mesh. NRAMM National Resource for Automated Molecular Microscopy http://nramm.nysbc.org/nramm-images/ Source: Bridget Carragher View Media

Antitoxin GhoS (Illustration 1)

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Structure of the bacterial antitoxin protein GhoS. GhoS inhibits the production of a bacterial toxin, GhoT, which can contribute to antibiotic resistance. Rebecca Page and Wolfgang Peti, Brown University and Thomas K. Wood, Pennsylvania State University View Media

Master clock of the mouse brain

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An image of the area of the mouse brain that serves as the 'master clock,' which houses the brain's time-keeping neurons. The nuclei of the clock cells are shown in blue. Erik Herzog, Washington University in St. Louis View Media

Beta-galactosidase montage showing cryo-EM improvement--transparent background

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Composite image of beta-galactosidase showing how cryo-EM’s resolution has improved dramatically in recent years. Older images to the left, more recent to the right. Veronica Falconieri, Sriram Subramaniam Lab, National Cancer Institute View Media

Seeing signaling protein activation in cells 04

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Cdc42, a member of the Rho family of small guanosine triphosphatase (GTPase) proteins, regulates multiple cell functions, including motility, proliferation, apoptosis, and cell morphology. Klaus Hahn, University of North Carolina, Chapel Hill Medical School View Media

Self-organizing proteins

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Under the microscope, an E. coli cell lights up like a fireball. Each bright dot marks a surface protein that tells the bacteria to move toward or away from nearby food and toxins. View Media

The Structure of Cilia’s Doublet Microtubules

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Cilia (cilium in singular) are complex molecular machines found on many of our cells. Brown Lab, Harvard Medical School and Veronica Falconieri Hays View Media

Rabbit GPDA

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A crystal of rabbit GPDA protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View Media

Wreath-shaped protein from X. campestris

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Crystal structure of a protein with unknown function from Xanthomonas campestris, a plant pathogen. Eight copies of the protein crystallized to form a ring. Ken Schwinn and Sonia Espejon-Reynes, New York SGX Research Center for Structural Genomics View Media

Enzymes convert subtrates into products

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Enzymes convert substrates into products very quickly. See image 2522 for a labeled version of this illustration. Featured in The Chemistry of Health. Crabtree + Company View Media

Weblike sheath covering developing egg chambers in a giant grasshopper

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The lubber grasshopper, found throughout the southern United States, is frequently used in biology classes to teach students about the respiratory system of insects. Kevin Edwards, Johny Shajahan, and Doug Whitman, Illinois State University. View Media

Flower-forming cells in a small plant related to cabbage (Arabidopsis)

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In plants, as in animals, stem cells can transform into a variety of different cell types. The stem cells at the growing tip of this Arabidopsis plant will soon become flowers. Arun Sampathkumar and Elliot Meyerowitz, California Institute of Technology View Media

Plastic-eating enzymes

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PETase enzyme degrades polyester plastic (polyethylene terephthalate, or PET) into monohydroxyethyl terephthalate (MHET). Amy Wu and Christine Zardecki, RCSB Protein Data Bank. View Media

Insulin and protein interact in pancreatic beta cells

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A large number of proteins interact with the hormone insulin as it is produced in and secreted from the beta cells of the pancreas. William E. Balch, The Scripps Research Institute View Media

Bacteria working to eat

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Gram-negative bacteria perform molecular acrobatics just to eat. Because they're encased by two membranes, they must haul nutrients across both. Emad Tajkhorshid, University of Illinois at Urbana-Champaign View Media

Catalase diversity

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Catalases are some of the most efficient enzymes found in cells. Amy Wu and Christine Zardecki, RCSB Protein Data Bank. View Media

Structure of a key antigen protein involved with Hepatitis C Virus infection

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A three-dimensional representation of the structure of E2, a key antigen protein involved with hepatitis C virus infection. Mansun Law Associate Professor Department of Immunolgy and Microbial Science The Scripps Research Institute View Media

A dynamic model of the DNA helicase protein complex

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This short video shows a model of the DNA helicase in yeast. This DNA helicase has 11 proteins that work together to unwind DNA during the process of copying it, called DNA replication. Huilin Li, Stony Brook University View Media

Relapsing fever bacterium (gray) and red blood cells

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Relapsing fever is caused by a bacterium and transmitted by certain soft-bodied ticks or body lice. The disease is seldom fatal in humans, but it can be very serious and prolonged. NIAID View Media

Bovine trypsin

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A crystal of bovine trypsin protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View Media

Secreted protein from Mycobacteria

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Model of a major secreted protein of unknown function, which is only found in mycobacteria, the class of bacteria that causes tuberculosis. Mycobacterium Tuberculosis Center, PSI View Media

Zinc finger

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The structure of a gene-regulating zinc finger protein bound to DNA. Jeremy M. Berg, National Institute of General Medical Sciences View Media

Zika virus

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Zika virus is shown in cross section at center left. On the outside, it includes envelope protein (red) and membrane protein (magenta) embedded in a lipid membrane (light purple). Amy Wu and Christine Zardecki, RCSB Protein Data Bank. View Media

Molecular view of glutamatergic synapse

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This illustration highlights spherical pre-synaptic vesicles that carry the neurotransmitter glutamate. Amy Wu and Christine Zardecki, RCSB Protein Data Bank. View Media

Protein from E. faecalis

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X-ray structure of a DNA repair enzyme superfamily representative from the human gastrointestinal bacterium Enterococcus faecalis. Midwest Center for Structural Genomics View Media

Bacteriophage P22 capsid, detail

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Detail of a subunit of the capsid, or outer cover, of bacteriophage P22, a virus that infects the Salmonella bacteria. Dr. Wah Chiu, Baylor College of Medicine View Media

Brains of sleep-deprived and well-rested fruit flies

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On top, the brain of a sleep-deprived fly glows orange because of Bruchpilot, a communication protein between brain cells. These bright orange brain areas are associated with learning. Chiara Cirelli, University of Wisconsin-Madison View Media

Life of an AIDS virus

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HIV is a retrovirus, a type of virus that carries its genetic material not as DNA but as RNA. Crabtree + Company View Media

Phenylalanine tRNA molecule

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Phenylalanine tRNA showing the anticodon (yellow) and the amino acid, phenylalanine (blue and red spheres). Patrick O'Donoghue and Dieter Soll, Yale University View Media

Protein map

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Network diagram showing a map of protein-protein interactions in a yeast (Saccharomyces cerevisiae) cell. This cluster includes 78 percent of the proteins in the yeast proteome. Hawoong Jeong, KAIST, Korea View Media

Nuclear Lamina

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The 3D single-molecule super-resolution reconstruction of the entire nuclear lamina in a HeLa cell was acquired using the TILT3D platform. Anna-Karin Gustavsson, Ph.D. View Media

H1N1 Influenza Virus

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CellPack image of the H1N1 influenza virus, with hemagglutinin and neuraminidase glycoproteins in green and red, respectively, on the outer envelope (white); matrix protein in gray, and ribonucleoprot Dr. Rommie Amaro, University of California, San Diego View Media

Measles virus proteins

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A cross section of the measles virus in which six proteins (enlarged on the outside of the virus) work together to infect cells. Amy Wu and Christine Zardecki, RCSB Protein Data Bank. View Media

SARS-CoV-2 nucleocapsid dimer

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In SARS-CoV-2, the virus that causes COVID-19, nucleocapsid is a complex molecule with many functional parts. Amy Wu and Christine Zardecki, RCSB Protein Data Bank. View Media

Enzyme reaction

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Enzymes speed up chemical reactions by reducing the amount of energy needed for the reactions. NIGMS View Media

Diversity oriented synthesis: generating skeletal diversity using folding processes

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This 1 1/2-minute video animation was produced for chemical biologist Stuart Schreiber's lab page. The animation shows how diverse chemical structures can be produced in the lab. Eric Keller View Media

Bovine milk alpha-lactalbumin (1)

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A crystal of bovine milk alpha-lactalbumin protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View Media

Cas4 nuclease protein structure

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This wreath represents the molecular structure of a protein, Cas4, which is part of a system, known as CRISPR, that bacteria use to protect themselves against viral invaders. Fred Dyda, NIDDK View Media

Nociceptin/orphanin FQ peptide opioid receptor

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The receptor is shown bound to an antagonist, compound-24 Raymond Stevens, The Scripps Research Institute View Media

Beta2-adrenergic receptor protein

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Crystal structure of the beta2-adrenergic receptor protein. The Stevens Laboratory, The Scripps Research Institute View Media

VDAC video 02

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This video shows the structure of the pore-forming protein VDAC-1 from humans. Gerhard Wagner, Harvard Medical School View Media

Protein involved in cell division from Mycoplasma pneumoniae

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Model of a protein involved in cell division from Mycoplasma pneumoniae. This model, based on X-ray crystallography, revealed a structural domain not seen before. Berkeley Structural Genomics Center, PSI View Media

PanB from M. tuberculosis (2)

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Model of an enzyme, PanB, from Mycobacterium tuberculosis, the bacterium that causes most cases of tuberculosis. This enzyme is an attractive drug target. Mycobacterium Tuberculosis Center, PSI-1 View Media

Bacterial alpha amylase

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A crystal of bacterial alpha amylase protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View Media

Rhodopsin bound to visual arrestin

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Rhodopsin is a pigment in the rod cells of the retina (back of the eye). It is extremely light-sensitive, supporting vision in low-light conditions. Protein Data Bank. View Media

Building blocks and folding of proteins

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Proteins are made of amino acids hooked end-to-end like beads on a necklace. To become active, proteins must twist and fold into their final, or "native," conformation. Crabtree + Company View Media

ATP Synthase

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Atomic model of the membrane region of the mitochondrial ATP synthase built into a cryo-EM map at 3.6 Å resolution. ATP synthase is the primary producer of ATP in aerobic cells. Bridget Carragher, <a href="http://nramm.nysbc.org/">NRAMM National Resource for Automated Molecular Microscopy</a> View Media

Worm sperm

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To develop a system for studying cell motility in unnatrual conditions -- a microscope slide instead of the body -- Tom Roberts and Katsuya Shimabukuro at Florida State University disassembled and rec Tom Roberts, Florida State University View Media

Abnormal, spiky fibroblast

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This is a fibroblast, a connective tissue cell that plays an important role in wound healing. Normal fibroblasts have smooth edges. Praveen Suraneni, Stowers Institute for Medical Research, Kansas City, Mo. View Media

3D reconstruction of a tubular matrix in peripheral endoplasmic reticulum

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Detailed three-dimensional reconstruction of a tubular matrix in a thin section of the peripheral endoplasmic reticulum between the plasma membranes of the cell. Jennifer Lippincott-Schwartz, Howard Hughes Medical Institute Janelia Research Campus, Virginia View Media