Fig. 1. sog transcription is reduced in sog^P129D embryos. sog expression in wild-type (A,B) or sog^P129D (C,D) cellular blastoderm embryos. Lateral views (A,C) and ventral views (B,D). To directly compare levels of sog expression, wild-type and sog^P129D embryos were mixed in the same tube and assayed for both sog and Race transcription (both in blue). The lack of Race expression in the presumptive amnioserosa of sog^P129D embryos was used to differentiate the two genotypes.