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Fig. 1. Rspo2 is disrupted in the transgene insertional mutation
footless. (A) Rspo2 gene. Untranslated exons are
shown in black, arrows indicate the location of PCR primers. (B)
Northern blot of E11.0 embryo total RNA. Arrow indicates full-length
transcript; arrowhead indicates alternatively spliced transcript. (C)
RT-PCR of E11.0 embryonic cDNA. The primers for exons 3-6 spanning the
transgene integration site detected only small amounts of product in
Rspo2Tg/Tg embryos.