TY - RPRT TI - Age-related decrease in frequencies of B-cell precursors and specific helper T cells involved in the IgG anti-tetanus toxoid antibody production in humans. AU - S Kishimoto AU - S Tomino AU - H Mitsuya AU - H Nishimura PY - 1982 DO - 10.1016/0090-1229(82)90159-3 UR - https://pubmed.ncbi.nlm.nih.gov/6217937/ ID - 6217937 ER -