Image and Video Gallery

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.

Interphase in Xenopus frog cells

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These images show frog cells in interphase. The cells are Xenopus XL177 cells, which are derived from tadpole epithelial cells. The microtubules are green and the chromosomes are blue. Claire Walczak, who took them while working as a postdoc in the laboratory of Timothy Mitchison. View Media

Chromosomes after crossing over

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Duplicated pair of chromosomes have exchanged material. Judith Stoffer View Media

Host infection stimulates antibiotic resistance

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This illustration shows pathogenic bacteria behave like a Trojan horse: switching from antibiotic susceptibility to resistance during infection. View Media

Recombinant DNA

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To splice a human gene into a plasmid, scientists take the plasmid out of an E. coli bacterium, cut the plasmid with a restriction enzyme, and splice in human DNA. Crabtree + Company View Media

Apoptosis reversed

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Two healthy cells (bottom, left) enter into apoptosis (bottom, center) but spring back to life after a fatal toxin is removed (bottom, right; top). Hogan Tang of the Denise Montell Lab, Johns Hopkins University School of Medicine View Media

Lily mitosis 10

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A light microscope image of a cell from the endosperm of an African globe lily (Scadoxus katherinae). This is one frame of a time-lapse sequence that shows cell division in action. Andrew S. Bajer, University of Oregon, Eugene View Media

Chromosome fiber 01

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This microscopic image shows a chromatin fiber--a DNA molecule bound to naturally occurring proteins. Marc Green and Susan Forsburg, University of Southern California View Media

Lily mitosis 04

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Retroviruses as fossils

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DNA doesn't leave a fossil record in stone, the way bones do. Instead, the DNA code itself holds the best evidence for organisms' genetic history. Emily Harrington, science illustrator View Media

Bottles of warfarin

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In 2007, the FDA modified warfarin's label to indicate that genetic makeup may affect patient response to the drug. The widely used blood thinner is sold under the brand name Coumadin®. Alisa Machalek, NIGMS/NIH View Media

Repairing DNA

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Like a watch wrapped around a wrist, a special enzyme encircles the double helix to repair a broken strand of DNA. Tom Ellenberger, Washington University School of Medicine View Media

CRISPR Illustration Frame 4

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This illustration shows, in simplified terms, how the CRISPR-Cas9 system can be used as a gene-editing tool. National Institute of General Medical Sciences. View Media

Lily mitosis 11

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A light microscope image of cells from the endosperm of an African globe lily (Scadoxus katherinae). This is one frame of a time-lapse sequence that shows cell division in action. Andrew S. Bajer, University of Oregon, Eugene View Media

Ciclo circadiano de un adolescente típico

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Los ritmos circadianos son cambios físicos, mentales y conductuales que siguen un ciclo de 24 horas. NIGMS View Media

Xenopus laevis egg

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Xenopus laevis, the African clawed frog, has long been used as a model organism for studying embryonic development. Michael Klymkowsky, University of Colorado, Boulder View Media

Fruit fly ovarioles

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Three fruit fly (Drosophila melanogaster) ovarioles (yellow, blue, and magenta) with egg cells visible inside them. Ovarioles are tubes in the reproductive systems of female insects. Vladimir I. Gelfand, Feinberg School of Medicine, Northwestern University. View Media

Dividing cells showing chromosomes and cell skeleton

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This pig cell is in the process of dividing. The chromosomes (purple) have already replicated and the duplicates are being pulled apart by fibers of the cell skeleton known as microtubules (green). Nasser Rusan, National Heart, Lung, and Blood Institute, National Institutes of Health View Media

RSV-Infected Cell

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Viral RNA (red) in an RSV-infected cell. Eric Alonas and Philip Santangelo, Georgia Institute of Technology and Emory University View Media

Computer sketch of bird-and-flower DNA origami

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A computer-generated sketch of a DNA origami folded into a flower-and-bird structure. See also related image 3690. Hao Yan, Arizona State University View Media

CRISPR Illustration Frame 1

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This illustration shows, in simplified terms, how the CRISPR-Cas9 system can be used as a gene-editing tool. This is the first frame in a series of four. National Institute of General Medical Sciences. View Media

Nucleolus subcompartments spontaneously self-assemble 4

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What looks a little like distant planets with some mysterious surface features are actually assemblies of proteins normally found in the cell's nucleolus, a small but very important protein complex lo Nilesh Vaidya, Princeton University View Media

RNA interference (with labels)

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RNA interference or RNAi is a gene-silencing process in which double-stranded RNAs trigger the destruction of specific RNAs. Crabtree + Company View Media

Histones in chromatin (with labels)

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Histone proteins loop together with double-stranded DNA to form a structure that resembles beads on a string. Crabtree + Company View Media

Introns (with labels)

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Genes are often interrupted by stretches of DNA (introns, blue) that do not contain instructions for making a protein. Crabtree + Company View Media

Golden gene chips

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A team of chemists and physicists used nanotechnology and DNA's ability to self-assemble with matching RNA to create a new kind of chip for measuring gene activity. Hao Yan and Yonggang Ke, Arizona State University View Media

Mapping human genetic variation

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This map paints a colorful portrait of human genetic variation around the world. Noah Rosenberg and Martin Soave, University of Michigan View Media

Pollen grains: male germ cells in plants and a cause of seasonal allergies

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Those of us who get sneezy and itchy-eyed every spring or fall may have pollen grains, like those shown here, to blame. Edna, Gil, and Amit Cukierman, Fox Chase Cancer Center, Philadelphia, Pa. 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

Cross section of a Drosophila melanogaster pupa lacking Draper

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In the absence of the engulfment receptor Draper, salivary gland cells (light blue) persist in the thorax of a developing Drosophila melanogaster pupa. Christina McPhee and Eric Baehrecke, University of Massachusetts Medical School View Media

RNA strand

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Ribonucleic acid (RNA) has a sugar-phosphate backbone and the bases adenine (A), cytosine (C), guanine (G), and uracil (U). Crabtree + Company View Media

Repairing DNA

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Like a watch wrapped around a wrist, a special enzyme encircles the double helix to repair a broken strand of DNA. Tom Ellenberger, Washington University School of Medicine 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

TFIID complex binds DNA to start gene transcription

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Gene transcription is a process by which the genetic information encoded in DNA is transcribed into RNA. Eva Nogales, Berkeley Lab View Media

Lily mitosis 07

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Meiosis illustration (with labels)

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Meiosis is the process whereby a cell reduces its chromosomes from diploid to haploid in creating eggs or sperm. Crabtree + Company View Media

Nucleosome

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Like a strand of white pearls, DNA wraps around an assembly of special proteins called histones (colored) to form the nucleosome, a structure responsible for regulating genes and condensing DNA strand Karolin Luger, Colorado State University View Media

Average teen circadian cycle

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Circadian rhythms are physical, mental, and behavioral changes that follow a 24-hour cycle. Typical circadian rhythms lead to high energy during the middle of the day (10 a.m. NIGMS View Media

Alternative splicing (with labels)

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Arranging exons in different patterns, called alternative splicing, enables cells to make different proteins from a single gene. Featured in The New Genetics. Crabtree + Company View Media

Alternative splicing

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Arranging exons in different patterns, called alternative splicing, enables cells to make different proteins from a single gene. Crabtree + Company View Media

A molecular interaction network in yeast 1

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The image visualizes a part of the yeast molecular interaction network. Keiichiro Ono, UCSD View Media

Epigenetic code (with labels)

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The "epigenetic code" controls gene activity with chemical tags that mark DNA (purple diamonds) and the "tails" of histone proteins (purple triangles). Crabtree + Company View Media

Dicer generates microRNAs

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The enzyme Dicer generates microRNAs by chopping larger RNA molecules into tiny Velcro^®-like pieces. MicroRNAs stick to mRNA molecules and prevent the mRNAs from being made into proteins. Crabtree + Company View Media

Fruit fly ovaries

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Fruit fly (Drosophila melanogaster) ovaries with DNA shown in magenta and actin filaments shown in light blue. This image was captured using a confocal laser scanning microscope.
Vladimir I. Gelfand, Feinberg School of Medicine, Northwestern University. View Media

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