metrizamide-gradient purified rat peritoneal mast cells were allowed to adhere to schistosomula of s. mansoni that had been preincubated in either minimum essential medium with 5 % fetal calf serum ( mem/fcs ) , heat-inactivated serum from rats 8 weeks after cercarial infection ( irs ) fresh normal rat serum as a source of complement ( nrs ) , or irs and nrs .
C0229671
serum
C0009498
complement