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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.

Red blood cells

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This image of human red blood cells was obtained with the help of a scanning electron microscope, an instrument that uses a finely focused electron beam to yield detailed images of the surface of a sa Tina Weatherby Carvalho, University of Hawaii at Manoa View Media

Developing fruit fly nerve cord

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The glial cells (black dots) and nerve cells (brown bands) in this developing fruit fly nerve cord formed normally despite the absence of the SPITZ protein, which blocks their impending suicide. Hermann Steller, Rockefeller University View Media

Induced pluripotent stem cells from skin

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These induced pluripotent stem cells (iPS cells) were derived from a woman's skin. Green and red indicate proteins found in reprogrammed cells but not in skin cells (TRA1-62 and NANOG). Kathrin Plath lab, University of California, Los Angeles, via CIRM View Media

Mitochondria from rat heart muscle cell_2

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These mitochondria (brown) are from the heart muscle cell of a rat. Mitochondria have an inner membrane that folds in many places (and that appears here as striations). National Center for Microscopy and Imaging Research View Media

Crab larva eye

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Colorized scanning electron micrographs progressively zoom in on the eye of a crab larva. In the higher-resolution frames, bacteria are visible on the eye. Tina Weatherby Carvalho, University of Hawaii at Manoa 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

Spreading Cells- 02

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Cells move forward with lamellipodia and filopodia supported by networks and bundles of actin filaments. Proper, controlled cell movement is a complex process. Rong Li and Praveen Suraneni, Stowers Institute for Medical Research View Media

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

Seeing signaling protein activation in cells 02

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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

Colorful cells

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Actin (purple), microtubules (yellow), and nuclei (green) are labeled in these cells by immunofluorescence. This image won first place in the Nikon 2003 Small World photo competition. Torsten Wittmann, Scripps Research Institute View Media

Scanning electron microscopy of the ECM on the surface of a calf muscle

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This image shows the extracellular matrix (ECM) on the surface of a soleus (lower calf) muscle in light brown and blood vessels in pink. Tom Deerinck, National Center for Microscopy and Imaging Research (NCMIR) View Media

“Two-faced” Janus particle activating a macrophage

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A macrophage—a type of immune cell that engulfs invaders—“eats” and is activated by a “two-faced” Janus particle. Yan Yu, Indiana University, Bloomington. View Media

Bacteriophage P22 capsid

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Cryo-electron microscopy (cryo-EM) has the power to capture details of proteins and other small biological structures at the molecular level.  This image shows proteins in the capsid, or outer co Dr. Wah Chiu, Baylor College of Medicine View Media

Movements of myosin

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Inside the fertilized egg cell of a fruit fly, we see a type of myosin (related to the protein that helps muscles contract) made to glow by attaching a fluorescent protein. Victoria Foe, University of Washington View Media

Biofilm blocking fluid flow

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This time-lapse movie shows that bacterial communities called biofilms can create blockages that prevent fluid flow in devices such as stents and catheters over a period of about 56 hours. Bonnie Bassler, Princeton University 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

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

Mitosis - anaphase

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A cell in anaphase during mitosis: Chromosomes separate into two genetically identical groups and move to opposite ends of the spindle. Judith Stoffer View Media

Zinc levels in a plant leaf

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Zinc is required for the function of more than 300 enzymes, including those that help regulate gene expression, in various organisms including humans. Suzana Car, Dartmouth College View Media

Dividing cell

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As this cell was undergoing cell division, it was imaged with two microscopy techniques: differential interference contrast (DIC) and confocal. The DIC view appears in blue and shows the entire cell. Dylan T. Burnette, Vanderbilt University School of Medicine. View Media

Golgi

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The Golgi complex, also called the Golgi apparatus or, simply, the Golgi. Judith Stoffer View Media

In vitro assembly of a cell-signaling pathway

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T cells are white blood cells that are important in defending the body against bacteria, viruses and other pathogens. Xiaolei Su, HHMI Whitman Center of the Marine Biological Laboratory View Media

Human retinal organoid

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A replica of a human retina grown from stem cells. Kevin Eliceiri, University of Wisconsin-Madison. View Media

An insect tracheal cell delivers air to muscles

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Insects like the fruit fly use an elaborate network of branching tubes called trachea (green) to transport oxygen throughout their bodies. Jayan Nair and Maria Leptin, European Molecular Biology Laboratory, Heidelberg, Germany View Media

Skin cell (keratinocyte)

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This normal human skin cell was treated with a growth factor that triggered the formation of specialized protein structures that enable the cell to move. Torsten Wittmann, University of California, San Francisco 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

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

Flu virus proteins during self-replication

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Influenza (flu) virus proteins in the act of self-replication. Viral nucleoprotein (blue) encapsidates [encapsulates] the RNA genome (green). Scripps Research Institute in La Jolla, CA View Media

Sperm cell

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Illustration of a sperm, the male reproductive cell. Judith Stoffer View Media

How a microtubule builds and deconstructs

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A microtubule, part of the cell's skeleton, builds and deconstructs. View Media

Mouse brain slice showing nerve cells

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A 20-µm thick section of mouse midbrain. The nerve cells are transparent and weren’t stained. Michael Shribak, Marine Biological Laboratory/University of Chicago. View Media

Nucleolinus

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The nucleolinus is a cellular compartment that has been a lonely bystander in scientific endeavors. Mary Anne Alliegro, Marine Biological Laboratory View Media

Mapping brain differences

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This image of the human brain uses colors and shapes to show neurological differences between two people. Arthur Toga, University of California, Los Angeles 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

Shiga toxin being sorted inside a cell

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Shiga toxin (green) is sorted from the endosome into membrane tubules (red), which then pinch off and move to the Golgi apparatus. Somshuvra Mukhopadhyay, The University of Texas at Austin, and Adam D. Linstedt, Carnegie Mellon University View Media

Simulation of leg muscles moving

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When we walk, muscles and nerves interact in intricate ways. This simulation, which is based on data from a six-foot-tall man, shows these interactions. Chand John and Eran Guendelman, Stanford University View Media

Glowing fish

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Professor Marc Zimmer's family pets, including these fish, glow in the dark in response to blue light. Featured in the September 2009 issue of Findings. View Media

Induced pluripotent stem cells from skin 02

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These induced pluripotent stem cells (iPS cells) were derived from a woman's skin. Blue show nuclei. Green show a protein found in iPS cells but not in skin cells (NANOG). Kathrin Plath lab, University of California, Los Angeles, via CIRM View Media

Lily mitosis 03

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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

Hydra 04

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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

Lipid raft

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Researchers have learned much of what they know about membranes by constructing artificial membranes in the laboratory. Judith Stoffer View Media

Fruit fly in the pink

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Fruit flies are a common model organism for basic medical research. Crabtree + Company 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

Smooth muscle from human ES cells

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These smooth muscle cells were derived from human embryonic stem cells. The nuclei are stained blue, and the proteins of the cytoskeleton are stained green. Alexey Terskikh lab, Burnham Institute for Medical Research, via CIRM View Media

Genetically identical mycobacteria respond differently to antibiotic 2

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Antibiotic resistance in microbes is a serious health concern. So researchers have turned their attention to how bacteria undo the action of some antibiotics. Bree Aldridge, Tufts University 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

Cultured cells

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This image of laboratory-grown cells was taken with the help of a scanning electron microscope, which yields detailed images of cell surfaces. Tina Weatherby Carvalho, University of Hawaii at Manoa 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

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

Sea urchin embryo 02

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Stereo triplet of a sea urchin embryo stained to reveal actin filaments (orange) and microtubules (blue). George von Dassow, University of Washington View Media