SOX2 regulates self-renewal and tumorigenicity of human melanoma-initiating cells. - Santini, R.; Pandolfi, S.; Pietrobono, S.; Montagnani, V.; D'Amico, M.; Penachioni, J. Y.; Vinci, M. C.; Borgognoni, L.; Stecca, B. (Oncogene, 2014)