Growth of alveolar bone cells during the subculturing.

Cells were isolated from 5 samples of alveolar bone in parallel by explant cultures (e-, full symbols) and by collagenase digestion (c-, open symbols) and were continuously subcultured for up to 8 subsequent passages. Increases in total numbers of cells (A) and in number of population doublings (PD) (B) are shown as a function of culture time, for each cell culture sample.