Predicted to enable complement binding activity. Acts upstream of or within negative regulation of activation of membrane attack complex. Located in cell surface and plasma membrane. Is expressed in blood; heart; liver; lung; and testis. Human ortholog(s) of this gene implicated in colorectal carcinoma and ovarian cancer. Orthologous to human CD59 (CD59 molecule (CD59 blood group)). [provided by Alliance of Genome Resources, Apr 2022]