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Fig. 2. Spatiotemporal expression pattern of XPACE4. (A) Real-time RT-PCR
analysis of the wild-type embryos at the indicated stages shows that
XPACE4 mRNA is abundant maternally and its level increases pre-MBT
(stage 6 and 8) and gradually declines after gastrulation (stage 10 and 12.5).
(B) The comparison of oligo dT (dT) versus random hexamer (R6) primed cDNA
shows the increase in XPACE4 levels pre-MBT is due to polyadenylation
of the maternal mRNA. (C) Whole-mount in situ hybridization shows that XPACE4
is localized during early oogenesis. Inset shows XPACE4 mRNA
localization in the mitochondrial cloud of stage 1 oocytes. No signal is
detected with the sense probe (S). (D) XPACE4 is localized to the
vegetal hemisphere of full-grown oocytes. (E,F) Hemisected stage 10 (E) and
stage 11 (F) embryos show XPACE4 mRNA remains localized to the
endodermal precursors during gastrulation (dorsal side on the right). (G) At
stage 30, XPACE4 is detected in a group of cells in the endoderm
after the embryos are bleached and cleared. (H) At stage 35/36,
XPACE4 is detected in the olfactory bulb, the brain and the
notochord. The lower embryo is the sense control. Inset shows the notochord in
transverse sections. S, sense control.