Relative potency of different forms of TGFβ.

Cultures were treated with a wide range of concentrations of TGFβ 1, 2, and 3 between day 2 and day 4 (hour 52 → hour 90), then reseeded and grown in TGFβ-free medium. The percentage of F+ cells was determined on day 8. Data are average values from 2 independent experiments with blood from different donors. The range of values is indicated by vertical bars. Some bars are not visible because they fall within the extension of the symbols.