f ( 1 ) hybrid chicks isogenic for the strong b histocompatibility locus and for most weak h-loci were x-irradiated on day 1 after hatching , injected intraperitoneally on day 2 with dispersed cells of bursa , spleen , or thymus from 4- or 10-wk-old f ( 1 ) hybrid donors , and immediately challenged by the same route with either brucella abortus , sheep erythrocytes , or a mixture of both together .
C1708726
loci
C0007634
cells