Additional Supporting Information may be found in the online version of this article.

DVDY_22000_sm_SupplData.doc20KSupplemental Information: Total RNAs were isolated from prrx1b morphant embryos, and subjected to RT-PCR using primers indicated (Fig. 5G). These PCR products were directly sequenced and in-framed stop codon in intron regions were identified and underlined. Base pairs in intron regions are indicated using small letters, and base pairs in the exon are labeled using large letters.

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