A normal mouse sits between two mice engineered to express green fluorescent protein.
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The organs of the glass frog, Hyalinobatrachium colymbiphyllum, are visible through its skin.
The parasite Schistosoma burrows through human skin, attaches to veins with a sucker (pictured here), and lays eggs, which the body expels in fecal matter, ready to infect anew.
A male European bee-eater catches an insect to feed his mate as part of a courtship ritual.
During the metaphase stage of mitosis, the chromosomes (blue) align in the center of the cell, as the microtubules (red) prepare to pull them in opposite directions, dragging them by their kinetochores (green).
Neural progenitor cells (green) develop into astrocytes (orange), which are found throughout the central nervous system and play important roles in synapse function, neural injury response, and other processes.
The flatworm Convolutriloba longifissura looks green in some sections because symbiotic algae dwell in its skin.
The food-borne pathogen Listeria monocytogenes (green) invades the body through the tips of the intestine's villi (red), which constantly shed cells, exposing a protein the bacterium exploits to gain entry.
This disease-causing bacterium, Legionella pneumofila (green), may look like it's about to get eaten, but it resists being digested and thrives within the amoeba (orange).
The starlet sea anemone has no brain, but the same genes that determine the head's location in humans are expressed on its lower end (left), opposite its mouth and tentacles.
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