Female sex bias in human embryonic stem cell lines. - Ben-Yosef D; Amit A; Malcov M; Frumkin T; Ben-Yehudah A; Eldar I; Mey-Raz N; Azem F; Altarescu G; Renbaum P; Beeri R; Varshaver I; et al. (Stem cells and development, 2012)