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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.

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

Cell division phases in Xenopus frog cells

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These images show three stages of cell division in Xenopus XL177 cells, which are derived from tadpole epithelial cells. They are (from top): metaphase, anaphase and telophase. Claire Walczak, who took them while working as a postdoc in the laboratory of Timothy Mitchison View Media

Fruit fly embryo

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Cells in an early-stage fruit fly embryo, showing the DIAP1 protein (pink), an inhibitor of apoptosis. Hermann Steller, Rockefeller University View Media

Taste buds signal different tastes through ATP release

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Taste buds in a mouse tongue epithelium with types I, II, and III taste cells visualized by cell-type-specific fluorescent antibodies. Aki Taruno, Perelman School of Medicine, University of Pennsylvania View Media

DDR2 Receptors Attach to Collagen in Breast Tumor

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On the left, the boundary of a breast tumor (yellow) attaches to collagen fibers that are closest to it (green) using DDR2. On the right, a tumor without DDR2 remains disconnected from the collagen. Callie Corsa and Suzanne Ponik, Washington University School of Medicine in St. Louis View Media

Fruit fly retina 02

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Section of a fruit fly retina showing the light-sensing molecules rhodopsin-5 (blue) and rhodopsin-6 (red). Hermann Steller, Rockefeller University View Media

Cerebellum: the brain's locomotion control center

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The cerebellum of a mouse is shown here in cross-section. The cerebellum is the brain's locomotion control center. Thomas Deerinck, National Center for Microscopy and Imaging Research, University of California, San Diego View Media

Cells lining the blood vessel walls

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The structure of the endothelium, the thin layer of cells that line our arteries and veins, is visible here. Christopher V. Carman and Roberta Martinelli, Harvard Medical School. 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

Annotated TEM cross-section of C. elegans (roundworm)

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The worm Caenorhabditis elegans is a popular laboratory animal because its small size and fairly simple body make it easy to study. Piali Sengupta, Brandeis University 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

Microtubules and tau aggregates

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Microtubules (magenta) and tau protein (light blue) in a cell model of tauopathy. Melike Lakadamyali, Perelman School of Medicine at the University of Pennsylvania. 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

Crane fly spermatocyte undergoing meiosis

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A crane fly spermatocyte during metaphase of meiosis-I, a step in the production of sperm. Michael Shribak, Marine Biological Laboratory/University of Chicago. View Media

Blood Clot

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Thomas Deerinck, NCMIR View Media

Confocal microscopy image of two Drosophila ovarioles

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Ovarioles in female insects are tubes in which egg cells (called oocytes) form at one end and complete their development as they reach the other end of the tube. 2004 Olympus BioScapes Competition View Media

Wound healing in process

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Wound healing requires the action of stem cells. Hermann Steller, Rockefeller University View Media

Egg comparison

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The largest human cell (by volume) is the egg. Human eggs are 150 micrometers in diameter and you can just barely see one with a naked eye. In comparison, consider the eggs of chickens...or ostriches! 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

Brain cells in the hippocampus

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Hippocampal cells in culture with a neuron in green, showing hundreds of the small protrusions known as dendritic spines. Shelley Halpain, UC San Diego View Media

Fly cells live

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If a picture is worth a thousand words, what's a movie worth? Denise Montell, Johns Hopkins University School of Medicine View Media

DNA and actin in cultured fibroblast cells

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DNA (blue) and actin (red) in cultured fibroblast cells. Tom Deerinck, National Center for Microscopy and Imaging Research (NCMIR) View Media

Plasma membrane

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The plasma membrane is a cell's protective barrier. See image 2524 for a labeled version of this illustration. Featured in The Chemistry of Health. Crabtree + Company View Media

Glowing glycans

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Sugars light up the cells in this jaw of a 3-day-old zebrafish embryo and highlight a scientific first: labeling and tracking the movements of sugar chains called glycans in a living organism. Carolyn Bertozzi, University of California, Berkeley View Media

Vesicle traffic

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This illustration shows vesicle traffic inside a cell. Judith Stoffer View Media

Transmission electron microscopy showing cross-section of the node of Ranvier

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Nodes of Ranvier are short gaps in the myelin sheath surrounding myelinated nerve cells (axons). Tom Deerinck, National Center for Microscopy and Imaging Research (NCMIR) View Media

E. Coli

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Thomas Deerinck, NCMIR View Media

Brain showing hallmarks of Alzheimer's disease

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Along with blood vessels (red) and nerve cells (green), this mouse brain shows abnormal protein clumps known as plaques (blue). Alvin Gogineni, Genentech View Media

String-like Ebola virus peeling off an infected cell

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After multiplying inside a host cell, the stringlike Ebola virus is emerging to infect more cells. Heinz Feldmann, Peter Jahrling, Elizabeth Fischer and Anita Mora, National Institute of Allergy and Infectious Diseases, National Institutes of Health View Media

Influenza virus attaches to host membrane

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Influenza A infects a host cell when hemagglutinin grips onto glycans on its surface. Crabtree + Company 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

Centrioles anchor cilia in planaria

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Centrioles (green) anchor cilia (red), which project on the surface of pharynx cells of the freshwater planarian Schmidtea mediterranea. Juliette Azimzadeh, University of California, San Francisco View Media

Quartered torso

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Cells function within organs and tissues, such as the lungs, heart, intestines, and kidney. Judith Stoffer View Media

NCMIR Intestine-1

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The small intestine is where most of our nutrients from the food we eat are absorbed into the bloodstream. Tom Deerinck, National Center for Microscopy and Imaging Research (NCMIR) View Media

Smooth ER

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The endoplasmic reticulum comes in two types: Rough ER is covered with ribosomes and prepares newly made proteins; smooth ER specializes in making lipids and breaking down toxic molecules. Judith Stoffer 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

Trypanosoma brucei, the cause of sleeping sickness

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Trypanosoma brucei is a single-cell parasite that causes sleeping sickness in humans. Michael Rout, Rockefeller University View Media

Human ES cells differentiating into neurons

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This image shows hundreds of human embryonic stem cells in various stages of differentiating into neurons. Guoping Fan lab, University of California, Los Angeles, via CIRM View Media

Epithelial cells

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This image mostly shows normal cultured epithelial cells expressing green fluorescent protein targeted to the Golgi apparatus (yellow-green) and stained for actin (magenta) and DNA (cyan). Tom Deerinck, National Center for Microscopy and Imaging Research (NCMIR) View Media

Wound healing in process

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Wound healing requires the action of stem cells. Hermann Steller, Rockefeller University View Media

Yeast cell

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A whole yeast (Saccharomyces cerevisiae) cell viewed by X-ray microscopy. Inside, the nucleus and a large vacuole (red) are visible. Carolyn Larabell, University of California, San Francisco and the Lawrence Berkeley National Laboratory View Media

HeLa cells

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Multiphoton fluorescence image of cultured HeLa cells with a fluorescent protein targeted to the Golgi apparatus (orange), microtubules (green) and counterstained for DNA (cyan). National Center for Microscopy and Imaging Research (NCMIR) View Media

Single-cell “radios” video

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Individual cells are color-coded based on their identity and signaling activity using a protein circuit technology developed by the Coyle Lab. Scott Coyle, University of Wisconsin-Madison. View Media

Transcription factor Sox17 controls embryonic development of certain internal organs

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During embryonic development, transcription factors (proteins that regulate gene expression) govern the differentiation of cells into separate tissues and organs. James M. Wells, Cincinnati Children's Hospital Medical Center 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

C. elegans with blue and yellow lights in the background

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These microscopic roundworms, called Caenorhabditis elegans, lack eyes and the opsin proteins used by visual systems to detect colors. H. Robert Horvitz and Dipon Ghosh, Massachusetts Institute of Technology. View Media

HeLa cells

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Scanning electron micrograph of just-divided HeLa cells. Zeiss Merlin HR-SEM. National Center for Microscopy and Imaging Research View Media

Cells keep their shape with actin filaments and microtubules

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This image shows a normal fibroblast, a type of cell that is common in connective tissue and frequently studied in research labs. James J. Faust and David G. Capco, Arizona State University 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

Bee venom toxin destroying a cell

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This video condenses 6.5 minutes into less than a minute to show how the toxin in bee venom, called melittin, destroys an animal or bacterial cell. Huey Huang, Rice University View Media