in 20 calf experiments , extending up to 335 days , 30 x 10 ( 6 ) fibroblasts ( in 50 ml media ) derived from a single holstein fetus were distributed on the urethane surface ( 360 +/- 50 cells/mm2 ) by rotation of a sealed device for three hours ( 12 revolutions/hour ) .
C0016030
fibroblasts
C0007634
cells