a double antibody radioimmunoassay was developed for kringle 4 and used for cross-reactivity studies with plasminogen , kringle 1 + 2 + 3 , kringle 5 + light chain , and the plasmin-antiplasmin complex , as competitors of either 125i-kringle 4 or 125i-lys-plasminogen for binding to anti-kringle 4 antisera .
C0032140
plasminogen
C0064417
kringle