Fig. 2

a (Upper panel) Cell cycle distribution of f-LSCs (P4 on the left; P30 on the right) performed according to Nicoletti’s protocol. (Lower panel) Increment of expression of CDKN1B in P30 vs. P4 (left); kinetics of f-LSCs at early passage (P4) and late passage (P30) in expansion medium (right). Mean values ± SD of a set of 25 experiments after 6 days. b Cytometric detection of double-positive cell populations for pluripotent stem cell markers at two different culture passages: early passage (P4) and late passage (P30). P passage