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embryo in the eye of a needle
Brain blood vessels.
Sperm competing to fertilize an egg.
An image of capillary, just wide enough for one red blood cell (erythrocyte) to squeeze through.
Kidney cortex, showing numerous glomeruli with their afferent and efferent arterioles and the peritubular capillary complexes.
☤ MD ☞☆☆☆ Electron microscope image of Sperm tails tangled up in a seminiferous tubule. Electron Micrograph. FEI Image Gallery. Courtesy of Clifford Barnes.
Les chiffres du cancer en France - Sciences et Avenir.