Six congenic lines containing B complex recombinants R1 = B-F/B-L24, B-G23; R2 = B-F/B-L2, BG23; R3 = B-F/B-L2, B-G23; R4 = B-F/B-L2, B-G23; R5 = B-F/B-L21, B-G19; and R6R6 = B-F/B-L21, B-G23 were tested individually for antibody response against SRBC. R2, R3 and R4 arose from independent recombination events but are serologically identical. Each B complex recombinant was crossed to inbred Line...