when prethrombin 1 [ a single-chain prothrombin derivative lacking fragment 1 , resulting from the action of thrombin on prothrombin ] is cleaved with cyanogen bromide , a fragment ( peptide cb67-129 ) is produced that , like the parent thrombin molecule , is mitogenic for j774 cells but not for fibroblasts .
C0007634
cells
C0016030
fibroblasts