Caspase activity in cell triggered to undergo apoptosis

A confocal micrograph showing caspase activity in a cell treated with 7-ketocholesterol to induce apoptosis. On receipt of signals that trigger apoptosis, there is a cascade of caspase activity in the cell, leading to the events that make up apoptosis. Nuclei are stained blue, cytochrome c green, and cleaved caspase-3 red.