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Fig. 3. In situ hybridization for PAPPA expresssion in wild-type mouse embryos. At
(A) E8.5 and (B) E9.5, PAPPA expression is mainly found in the developing
foregut (fg) and hindgut (hg). Staining in the optic and otic vesicle is an
artifact. At (C) E10.5 and (D) E11.5, PAPPA expression is seen in the cells
resembling migrating neural crest cells (arrowhead), in branchial arches
(asterisk), in the forelimbs (fl) and in a segmented pattern in the tail (t).
At (E) E12.5, (F) E13.5 and (G) E14.5, PAPPA expression persisted in the
developing limbs, tail, nasal region and the developing outer ear. Note that
in F an albino embryo is shown, indicating that there is no PAPPA expression
in the developing eye. (H) Higher magnification of the tail at E10.5 to
demonstrate the segmented expression in the developing somites. (I) Higher
magnification of the forelimb of an E13.5 embryo showing PAPPA expression in
the developing joints of the digits.