| class I antigen |
One of the major histocompatibility molecules present on almost all cells except human red blood cells. These antigens are important in the rejection of grafts and transplanted organs.
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| class II antigen |
One of the major histocompatibility molecules present on immunocompetent cells.
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| class restriction |
The requirement of certain T lymphocytes for the presence of either class I or class II major histocompatibility complex markers on antigen-presenting cells. These markers enable the T cells to recognize and respond to foreign
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| classic cesarean section |
Surgical removal of the fetus, placenta, and membranes through an incision in the abdominal and uterine walls.
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| classification of caries |
G. V. Black's classification of dental caries according to the part of the tooth involved: class I, occlusal; class II, interproximal, commonly at the dentinoenamel junction of bicuspids and molars; class III, interproxi
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