idioisolysin

An idiolysin occurring in the blood of an animal of a certain species, capable of combining with the red blood cells from animals of the same species, thereby causing hemolysis when complement is present.

* * *

id·io·isol·y·sin (id″e-o-i-solґə-sin) a lysin normally present which lyses the cells of other members of the same species as the animal in which it is formed.