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).
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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.
Toxoplasma gondii, parasitic protozoa that can cause problems during pregnancy, have been modified to glow so scientists can trace their paths as they loop and spiral around a petri dish.
Neural pathways form a mesh, with yellow representing language and connecting the frontal lobe on the left to the temporal lobe on the right, and the purple curlicue representing Broca's area, which coordinates speech.
This amphipod uses feathery bristles on its appendages to catch microscopic organisms for its next meal.
Plants' actin skeletons (green) and plastids (red) help them sense and respond to gravity.
A scanning electron micrograph of an acacia flower preserved in Australia before the Ice Age.
A heart with a hole in it is repaired using a patch from a cow's pericardium, the membrane that encloses the muscular organ.
Electron micrograph of the disease-causing protozoan Giardia lamblia partway through cell division, forming a heart shape.
Pancreatic cells missing a tumor-suppressing enzyme form a cyst that puffs up before collapsing in on itself.
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