Abstract
Summary
Human transplanation antigens, HL-A1 and HL-A2, have been obtained from cells of a single hematopoietic line which has both antigens. HL-A1 has been obtained essentially free of HL-A2. Both have a molecular weight of about 48,000. They appear to be of protein nature and can be labeled with radioiodine. The radioactive antigens permit the use of sensitive radioimmunoassay methods for identifying and quantitating HL-A antigens.
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