Primary anti-SRBC antibody response in BXSB recipients transplanted with TCDM cells. Bars: BXSB (A), BALB/c + BXSB → BXSB (B), BALB/c → BXSB (C), BXSB → BXSB (D), C57BL/6 (E), C57BL/6 → C57BL/6 (F), and BALB/c → C57BL/6 (G). PFC data are given per 5 × 105 spleen cells.