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Fruit fly ovary
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A fruit fly ovary, shown here, contains as many as 20 eggs. Fruit flies are not merely tiny insects that buzz around overripe fruit—they are a venerable scientific tool. Denise Montell, Johns Hopkins University and University of California, Santa Barbara View Media
Epithelial cell migration
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High-resolution time lapse of epithelial (skin) cell migration and wound healing. It shows an image taken every 13 seconds over the course of almost 14 minutes. Michael Shribak, Marine Biological Laboratory/University of Chicago. View Media
Human embryonic stem cells on feeder cells
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The nuclei stained green highlight human embryonic stem cells grown under controlled conditions in a laboratory. Blue represents the DNA of surrounding, supportive feeder cells. Julie Baker lab, Stanford University School of Medicine, via CIRM View Media
Stress Response in Cells
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Two highly stressed osteosarcoma cells are shown with a set of green droplet-like structures followed by a second set of magenta droplets. Julia F. Riley and Carlos A. Castañeda, Syracuse University View Media
Mitosis - metaphase
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A cell in metaphase during mitosis: The copied chromosomes align in the middle of the spindle. Judith Stoffer View Media
Cellular aging
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A protein called tubulin (green) accumulates in the center of a nucleus (outlined in pink) from an aging cell. Maximiliano D'Angelo and Martin Hetzer, Salk Institute View Media
Calcium uptake during ATP production in mitochondria
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Living primary mouse embryonic fibroblasts. Mitochondria (green) stained with the mitochondrial membrane potential indicator, rhodamine 123. Nuclei (blue) are stained with DAPI. Lili Guo, Perelman School of Medicine, University of Pennsylvania View Media
Stem cell differentiation
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Undifferentiated embryonic stem cells cease to exist a few days after conception. In this image, ES cells are shown to differentiate into sperm, muscle fiber, hair cells, nerve cells, and cone cells. Judith Stoffer View Media
Cell in two stages of division
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This image shows a cell in two stages of division: prometaphase (top) and metaphase (bottom). Lilian Kabeche, Dartmouth View Media
Cell-like compartments emerging from scrambled frog eggs
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Cell-like compartments spontaneously emerge from scrambled frog eggs, with nuclei (blue) from frog sperm. Endoplasmic reticulum (red) and microtubules (green) are also visible. Xianrui Cheng, Stanford University School of Medicine. View Media
Draper, shown in the fatbody of a Drosophila melanogaster larva
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The fly fatbody is a nutrient storage and mobilization organ akin to the mammalian liver. The engulfment receptor Draper (green) is located at the cell surface of fatbody cells. Christina McPhee and Eric Baehrecke, University of Massachusetts Medical School View Media
Cryo-ET cross-section of the Golgi apparatus
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On the left, a cross-section slice of a rat pancreas cell captured using cryo-electron tomography (cryo-ET). On the right, a 3D, color-coded version of the image highlighting cell structures. Xianjun Zhang, University of Southern California. View Media
Endothelial cell
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This image shows two components of the cytoskeleton, microtubules (green) and actin filaments (red), in an endothelial cell derived from a cow lung. Tina Weatherby Carvalho, University of Hawaii at Manoa View Media
Pathways: What is Basic Science?
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Learn about basic science, sometimes called “pure” or “fundamental” science, and how it contributes to the development of medical treatments. National Institute of General Medical Sciences View Media
Snowflake yeast 2
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Multicellular yeast called snowflake yeast that researchers created through many generations of directed evolution from unicellular yeast. William Ratcliff, Georgia Institute of Technology. View Media
Cellular metropolis
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Like a major city, a cell teems with specialized workers that carry out its daily operations--making energy, moving proteins, or helping with other tasks. Kathryn Howell, University of Colorado Health Sciences Center View Media
Streptococcus bacteria
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Image of Streptococcus, a type (genus) of spherical bacteria that can colonize the throat and back of the mouth. Stroptococci often occur in pairs or in chains, as shown here. Tina Weatherby Carvalho, University of Hawaii at Manoa View Media
Bacteria shapes
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A colorized scanning electron micrograph of bacteria. Scanning electron microscopes allow scientists to see the three-dimensional surface of their samples. Tina Weatherby Carvalho, University of Hawaii at Manoa View Media
Plasma-Derived Membrane Vesicles
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This fiery image doesn’t come from inside a bubbling volcano. Instead, it shows animal cells caught in the act of making bubbles, or blebbing. Jeanne Stachowiak, University of Texas at Austin View Media
Microtubule growth
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Map of microtubule growth rates. Rates are color coded. This is an example of NIH-supported research on single-cell analysis. Gaudenz Danuser, Harvard Medical School 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
Fruit fly sperm cells
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Developing fruit fly spermatids require caspase activity (green) for the elimination of unwanted organelles and cytoplasm via apoptosis. Hermann Steller, Rockefeller University View Media
Pathways: The Fascinating Cells of Research Organisms
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Learn how research organisms, such as fruit flies and mice, can help us understand and treat human diseases. National Institute of General Medical Sciences View Media
Z rings in bacterial division
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Lab-made liposomes contract where Z rings have gathered together and the constriction forces are greatest (arrows). Masaki Osawa, Duke University View Media
Hydra 05
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Hydra magnipapillata is an invertebrate animal used as a model organism to study developmental questions, for example the formation of the body axis. Hiroshi Shimizu, National Institute of Genetics in Mishima, Japan View Media
Proteins related to myotonic dystrophy
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Myotonic dystrophy is thought to be caused by the binding of a protein called Mbnl1 to abnormal RNA repeats. Manuel Ares, University of California, Santa Cruz View Media
Endoplasmic reticulum abnormalities 2
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Human cells with the gene that codes for the protein FIT2 deleted. After an experimental intervention, they are expressing a nonfunctional version of FIT2, shown in green. Michel Becuwe, Harvard University. View Media
Bicycling cell
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A humorous treatment of the concept of a cycling cell. Judith Stoffer View Media
Vimentin in a quail embryo
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Confocal image showing high levels of the protein vimentin (white) at the edge zone of a quail embryo. Cell nuclei are labeled green. Andrés Garcia, Georgia Tech View Media
G switch (with labels and stages)
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The G switch allows our bodies to respond rapidly to hormones. G proteins act like relay batons to pass messages from circulating hormones into cells. Crabtree + Company View Media
Hydra 02
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Hydra magnipapillata is an invertebrate animal used as a model organism to study developmental questions, for example the formation of the body axis. Hiroshi Shimizu, National Institute of Genetics in Mishima, Japan View Media
Yeast cells with nuclear envelopes and tubulin
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Yeast cells with nuclear envelopes shown in magenta and tubulin shown in light blue. The nuclear envelope defines the borders of the nucleus, which houses DNA. Alaina Willet, Kathy Gould’s lab, Vanderbilt University. View Media
Nucleolus subcompartments spontaneously self-assemble 1
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The nucleolus is a small but very important protein complex located in the cell's nucleus. Nilesh Vaidya, Princeton University View Media
Neuron with labeled synapses
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In this image, recombinant probes known as FingRs (Fibronectin Intrabodies Generated by mRNA display) were expressed in a cortical neuron, where they attached fluorescent proteins to either PSD95 (gre Don Arnold and Richard Roberts, University of Southern California. View Media
Worms and human infertility
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This montage of tiny, transparent C. elegans--or roundworms--may offer insight into understanding human infertility. Abby Dernburg, Lawrence Berkeley National Laboratory View Media
Math from the heart
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Watch a cell ripple toward a beam of light that turns on a movement-related protein. View Media
TonB protein in gram-negative bacteria
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The green in this image highlights a protein called TonB, which is produced by many gram-negative bacteria, including those that cause typhoid fever, meningitis and dysentery. Phillip Klebba, Kansas State University View Media
Synapses in culture
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Cultured hippocampal neurons grown on a substrate of glial cells (astrocytes). The glial cells form the pink/brown underlayment in this image. The tan threads are the neurons. National Center for Microscopy and Imaging Research View Media
Skin cross-section
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Cross-section of skin anatomy shows layers and different tissue types. National Institutes of Health Medical Arts View Media
3D image of actin in a cell
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Actin is an essential protein in a cell's skeleton (cytoskeleton). It forms a dense network of thin filaments in the cell. Xiaowei Zhuang, Howard Hughes Medical Institute, Harvard University View Media
Nerve ending
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A scanning electron microscope picture of a nerve ending. It has been broken open to reveal vesicles (orange and blue) containing chemicals used to pass messages in the nervous system. Tina Weatherby Carvalho, University of Hawaii at Manoa View Media
Four timepoints in gastrulation
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It has been said that gastrulation is the most important event in a person's life. Bob Goldstein, University of North Carolina, Chapel Hill View Media
Cell Nucleus and Lipid Droplets
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A cell nucleus (blue) surrounded by lipid droplets (yellow). James Olzmann, University of California, Berkeley View Media
Animal cell
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A typical animal cell, sliced open to reveal a cross-section of organelles. Judith Stoffer View Media
Dynamin structure
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When a molecule arrives at a cell's outer membrane, the membrane creates a pouch around the molecule that protrudes inward. Josh Chappie, National Institute of Diabetes and Digestive and Kidney Diseases, NIH View Media
Seeing signaling protein activation in cells 01
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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
Hydra 03
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Hydra magnipapillata is an invertebrate animal used as a model organism to study developmental questions, for example the formation of the body axis. Hiroshi Shimizu, National Institute of Genetics in Mishima, Japan View Media
Mitochondria and endoplasmic reticulum
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A computer model shows how the endoplasmic reticulum is close to and almost wraps around mitochondria in the cell. The endoplasmic reticulum is lime green and the mitochondria are yellow. Bridget Wilson, University of New Mexico View Media
