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A antigen
Surface antigen
Poliomyelitis antigen is a complex compound on the surface of the virus.
Red blood cells with an antigen on their surface are said to be Rh positive, Rh+. Rh negative, or Rh-, do nothave the surface antigen.
Antigen recognition
destroying the antigen
Blood type has to do with the antigens found on the surface of your red blood cells. Type A has the A antigen, type B has the B antigen, type AB has both, and type O has neither.
Rh protein is an antigen found on the surface of red blood cells. It is responsible for the "positive" or "negative" portion of blood type designations.
When your body is introduced to the Hepatitis B virus, the virus is considered the antigen (the surface antigen)and this should trigger your immune system to develop antibody against this antigen to destroy it. Most people do develop Hep B surface antibody when infected with the Hep B virus. Some people do not develop the antibodyand go on to have only circulating Hep B surface antigen - which means they are a carrier and can continue to have the virus and infection. For the majority of the population that develop the Hep B surface antibody, this conveys immunity to the virus for life.
Pretty sure it's to increase the surface area
potassium
Prostate Specific Antigen (PSA) is found in the blood stream. It is measured to detect possible prostate problems.