1. rhesus factor-a blood group antigen possessed by Rh-positive people; if an Rh-negative person receives a blood transfusion from an Rh-positive person it can result in hemolysis and anemia. Rh, Rh factor.. rhesus factor-a blood group antigen possessed by Rh-positive people; if an Rh-negative person receives a blood transfusion from an Rh-positive person it can result in hemolysis and anemia. Rh, Rh factor.
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Pronation or eversion is the inward roll of the foot (medial malleolus) while walking or running. Another way to look at pronation instead in terms of the degree of inward roll is in terms of where the foot pushes off at the end of each step, or at the end of the gait cycle.owever, overpronation and underpronation (supination) can be potentially harmful. Neutral pronation occurs when the foot experiences a normal, healthy amount of pronation instead of overpronating or underpronating. In healthy movement more of the toe area will be used when pushing off than in unhealthy movement.