a concentration of 560 nm prostaglandin e1 ( pge1 ) , in a medium containing either 10 % serum and 10 % plasma , or 20 % plasma and a platelet extract prepared from 24 x 10 ( 6 ) platelets/ml , caused after four days of incubation in a plasma clot culture system , highly significant increases over the controls in both the number of megakaryocyte colonies/clot and megakaryocytes/clot .
C0229671
serum
C0032105
plasma