production of 5-hiaa by human umbilical vein endothelial cells was 5.4+/-2.0 nmoles per 10 ( 9 ) cells per hour ( n=5 ) and by human foreskin fibroblasts was 3.9+/-1.4 nmoles per 10 ( 9 ) cells per hour ( n=5 ) .
C0016030
fibroblasts
C0007634
cells