Antigen is usually present on the blood that determine the person’s blood type. While antibodies in the blood attack foreign blood not compatible with the antigens on the blood.
What are antigens?
Blood group antigens seem to be either sugars or proteins that bind to various components of the red blood cell membrane. The antigens of the ABO blood group, for example, are sugars.
Whereas antibodies are present in the blood that determines certain antigens present in the blood that are non compatible.
Thus, the answer for blank 1 is antigen, and for blank 2 is antibody.
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