FIG. 4.

(A) Cells were grown as described in Materials and Methods and counted daily. (B) Cells were grown until confluence and then induced to differentiate as described in Materials and Methods. Cell counts started 1 day after the addition of the differentiation cocktail, as indicated, and were performed daily. For each type of experiment, one representative clone is shown; the results were confirmed on two additional clones. The data reported are the average results of two independent experiments.