[Individual variability in the proliferative potential of human diploid fibroblasts in vitro].

The rate of individual variability of proliferative potential determined by the percentage of colonies containing 16 and more cells (the cloning efficiency) was studied 16 embryonic and 15 postnatal strains of human diploid fibroblasts. It is highly probable that these differences are hereditary in nature and determined by the genotype of the given cell line. This conclusion is based on the fact that the cloning efficiency is a criterion marking each individual cell line and is well reproducible in a series of experiments.