however , sds-paag electrophoresis of sds- and mercaptoethanol-treated culture fluids revealed among 11 protein bands at least 4 antigens interacting with antibodies ( mr = 107 , 76 , 67 and 37 kd ) , although their antibody titers were far lower and did not exceed 1:300-1:500 .
C0005889
fluids
C0003241
antibodies