I References I antigen Ask Anything Homework Help Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: Ii blood group system…on the presence of antigens I and i on the surface of red blood cells. The Ii blood group system is associated with cold antibodies (antibodies that function only at temperatures below normal body heat) and several blood diseases. Read More…on the presence of antigens I and i on the surface of red blood cells. The Ii blood group system is associated with cold antibodies (antibodies that function only at temperatures below normal body heat) and several blood diseases. Read More