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Fig. 9. Illustration showing the expression patterns of mouse marker genes
expressed in the pluripotent cell population at each embryonic stage (upper),
and the subpopulation in ES cells (lower) that could be detected by expression
of these marker genes. ICM-like (Rex1+) and early
PrE-like (Rex1-) populations have different abilities for
in vitro differentiation and could convert into each other under normal
conditions for ES cell maintenance.