1) Lysin 
Cytolysin refers to the substance secreted by microorganisms, plants or animals that is specifically toxic to individual cells, in many cases causing their dissolution through lysis. Cytolysins that have a specific action for certain cells are named accordingly. For instance, the cytolysins responsible for the destruction of red blood cells, there...
A substance i.e., an antibody that effects partial or complete destruction of an animal cell; may require complement. ... See: perforin. ... (05 Mar 2000) ... 
(si-tol´ә-sin) a substance or antibody that produces cytolysis.
Type: Term Pronunciation: sī-tol′i-sin Definitions: 1. A substance an antibody that effects partial or complete destruction of an animal cell; may require complement.
noun a substance that partly or completely destroys animal cells
any substance that produces cytolysis.