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a) Phase contrast pictures of day 3 blast colony culture from Scl+/+ and Scl-/- ES cells. b) FACS analysis of CD41 and c-Kit expression during Scl-/- blast colony development. Numbers indicate the percentage of the respective populations. c) FACS analysis of Tie2 and c-Kit expression during Scl-/- blast colony development. d) Model of haemangioblast differentiation toward haematopoiesis in the yolk sac.
