types of blood a, b, ab, o. recipient and donor.

abo anatomy anti antibodies antigen antigens background blood body care cell cells certain compatibility concept corpuscles diagram donate donated donating donation donor drop education emergency erythrocytes generate group groups haematids health hemoglobin hospital human igm illustration immunological labeled laboratory life medical medicine microbiology negative only plasma positive present rbc rbcs received receiving recipient red rhesus scientific specific system test transfusion type types vector