Growth characteristics of pSSCs in vitro.

<p>(A) Proliferation of pSSCs: Given is the CPD (cumulative population doubling) of pSSCs as function of days in culture. Data are expressed as means ± SEM from three independent pSSC strains. (B) Average CFU efficiency of one representative pSSCs strain after 22 CPD. Mean of three experiments ± SEM. (C) Image of cell colonies (stained with trypan-blue) formed after 11 days seeded with 10 cells per cm² growth surface. Scale bar: 1 cm. (D, E) Morphological appearance of pSSCs. Scale bars: (D) 200 µm, (E) 100 µm.