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A blood type (also called a blood group) is a classification of blood based on the presence and absence of antibodies and also based on the presence or absence of inherited antigenic substances on the surface of red blood cells (RBCs). These antigens may be proteins, carbohydrates, glycoproteins, or glycolipids, depending on the blood group system. Some of these antigens are also present on the surface of other types of cells of various tissues. Several of these red blood cell surface antigens can stem from one allele (or an alternative version of a gene) and collectively form a blood group system. Blood types are inherited and represent contributions from both parents. A total of 35 human blood group systems are now recognized by the International Society of Blood Transfusion (ISBT). The two most important ones are ABO and the RhD antigen; they determine someone's blood type (A, B, AB and O, with +, − or Null denoting RhD status).
"I sent out the appeal after it was determined that no family members or close friends who had offered a kidney were a blood-type match," Mr. Joerg recalled.
Another was a tattoo-removal parlor that specialized in eliminating the mandatory blood-type identifiers that all SS soldiers had tattooed on the underside of their left arm, usually near the armpit.
Turner said the sisters are a blood-type match, but that tests to determine tissue compatibility still need to be done.
That task requires a multidisciplinary approach engaging archeo-linguistics, philosophy, comparative religion, physical and cultural anthropology, and blood-type analysis.
A few years ago, my wife came home with a book on the blood-type diet.
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