the cloning efficiency ( number of formed colonies per 1000 seeded cells ) was 13.7 +/- 1.9 , 3.2 +/- 0.6 , and 3.5 +/- 0.4 for chondrocytes isolated from 7- , 20- and 28-day-old rats and cultured for 14 days , respectively .
C0007634
cells
C0225369
chondrocytes