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Morphology of the stomach in fibroblast growth factor receptor 2IIIb/retinaldehyde dehydrogenase 2 (Fgfr2IIIb−/−; Raldh2+/−) mutants at embryonic day 18.5. (A) Fgfr2IIIb+/+; Raldh2+/− control littermates have normal external morphology of the stomach. Both Fgfr2IIIb+/+; Raldh2+/+ (B) and Fgfr2IIIb−/−; Raldh2+/− mutants (C) and have microgastria, indicating that haploinsufficiency of Raldh2 has no effect on this defect.
