Complex Antigens of the A System in Chickens
Segregation within the A locus and presence of 2 alleles — A13 and A14 — was detected within a highly inbred line of Iowa chickens. On the basis of genotype in the A system this line was divided into two sublines — IA and IB within which mutually exchanged skin grafts survived permanently. Specific antibodies were produced by reciprocal immunizations between individuals of these sublines. Analysis of these sera within a closed outbred WL population revealed the complexity of antigens A13 and A14. Typing of individual outbred families and absorption tests showed the presence of at least 2 antigenic factors within the A13 and of 4 antigenic factors within the A14 antigen. A different spectrum of anti-A antibodies obtained by immunization of recipients of the same blood group genotype with erythrocytes from the same donor or donors of identical genotype was found.
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