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X Inactivation

This animation shows how X chromosomes are randomly switched off in most female mammals.

Ubiquitin and the Proteasome

This animation shows how proteins in the cell are tagged for disposal by ubiquitin and then degraded by the proteasome.

Asexual vs. Sexual Reproduction

This video provides a demonstration of differences between sexual reproduction, which involves recombination through meiosis, and asexual reproduction, which does not.