the ontogeny of the humoral immune response to sheep red blood cells ( srbc ) , a non-infective antigen , and to killed escherichia coli ( e. coli ) , a disease-related antigen , was compared in young chicks of three poultry populations : a white leghorn layer strain and two strains of white rock broiler breeders .
C0020967
humoral immune response
C0003320
antigen