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Fig. 3. Runx1 expression in the allantois and chorion does not require
chorio-allantoic fusion. (A) Allantois (al) explant culture on
plastic (48 hours) from a Runx1lz/+ conceptus showing
Runx1 expression (blue) (3.2x). (B) Chorion (ch) explant culture
on plastic from a Runx1lz/+ conceptus (3.2x).
(C) Allantois sphere cultures (48 hours) from
Runx1lz/+ (lz/+) and wild-type (+/+) conceptuses
(left). Right hand panels are nuclear fast red stained histological sections
of whole mount preparations of allantoic spheres showing Runx1 expression
predominantly in mesothelium on the surface of the sphere. (D)
Tg(Ly6a/GFP) (Sca-1) expression from the freshly isolated
allantois and chorion and following 24 hours of culture on OP9 cells.