Noun
English Wikipedia has an article on:perforinWikipedia
perforin (countable and uncountable, plural perforins)
(biochemistry) A cytolytic protein found in natural killer cells.
Perforin, a pore-making monomeric granule released from natural killer cells and cytotoxic T lymphocytes, kills target cells by forming polymers and tubular structures not unlike the membrane attack complex of the complement system. Source: Internet