This family includes a 69 kD protein which has been identified as an islet cell autoantigen in type I diabetes mellitus [1]. Its precise function is unknown.

1: Genomic organization and transcript analysis of ICAp69, a target antigen in diabetic autoimmunity. Gaedigk R, Karges W, Hui MF, Scherer SW, Dosch HM; Genomics 1996;38:382-391. PMID:8975715