with the use of five rt1 recombinants , about 20 % of the dna fragments could be mapped to the rt1.a region , which codes for the ubiquitously expressed class i antigens , and about 80 % to the rt1.c region-determining class i-like antigens , which are different from rt1.a antigens with respect to tissue distribution , restriction function in immune responses , and allograft rejection .
C0019629
class i antigens
C1817756
function