“…J Pediatr 1979;95:964-9. 4 Stevens R, Dichek D, Keld B, Heiner D. IgG1 is the predominant subclass of in vivo-and in vitro-produced antitetanus toxoid antibodies and also serves as the membrane IgG molecule for delivering inhibitory signals to anti-tetanus toxoid antibody-producing cells. J Clin Immunol 1983;3:65-9.…”