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Fig. 5. Expression of FLK1 and GFP in differentiating Mixl1 wild-type
(w/w), heterozygote (GFP/w) and null (GFP/GFP) ES cells. (A) Time course of
FLK1 and GFP expression showing that the onset of FLK1 expression is delayed
and that the frequency of FLK1-positive cells was reduced in
Mixl1-deficient ES cells. (B,C) Summary of data (n=3-6)
demonstrating a lower percentage of FLK1+ cells (B) and a reduction
in the ratio of double-positive GFP+FLK1+ to
GFP+ cells (C) in day 4 EBs derived from two independent
Mixl1-deficient ES cell lines compared with their heterozygote
counterparts. The Mixl1-null lines M916 and M3C5 were derived from
Mixl1-heterozygous ES cell lines M147 and M114, respectively.
Mixl1w/w is the parental ES cell line. The error bars represent 1
s.d. and the P values indicated were derived using a two-tailed
t-test.