AD-MSC characterization. A) Cumulative population doublings of 3 AD-MSC lines. B) Telomerase activity in AD-MSC. The RTA was calculated from the different absorbances as follows: RTA = [(As sample-As heated-sample)]/[As Internal standard of the control template x 100]. It is representative of telomerase activity of 3 AD-MSC lines from different donors (median and range). C) Representative AD-MSC immunophenotype profile by flow cytometry at passages 4 and 7.