In addition to the ABO blood type, there are other types of human blood types, such as the GM blood type. The GM blood type is present in human serum and shows obvious ethnic specificity. The FB subtype like the GM blood type is unique to whites ST subtype is only found in yellow people; C3 subtype is only found in black people. From this:. ['People need to make GM blood type in addition to ABO blood type when transfusion.', 'All Africans have the C3 subtype of GM blood type.', 'People with GM blood type FB subtype will not be yellow.', 'Some whites can also have the ST subtype of GM blood type.']