am readily engulfed s. aureus organisms preopsonized with 1 % albumin , serum , or serum that had been heated ( 56 degrees c for 30 min ) to inactivate complement , whereas uptake of s. aureus by pmn occurred only after preopsonization with unheated , complement replete serum ( 2.5 % ) .
C0009498
complement
C0229671
serum