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. 1999 Jun 15;13(12):1589–1600. doi: 10.1101/gad.13.12.1589

Figure 3.

Figure 3

Localization of a left side-specific enhancer (ASE) in intron 1 of nodal. (A) Structures and activities of six constructs containing various portions of nodal downstream plus the proximal promoter region. The approximate location of the ASE is indicated by the red oval. (B) Anterior and posterior views as well as transverse sections of X-gal staining in embryos transgenic for 3′-1 or 3′-1hsp. In both types of transgenic embryos, the somatopleure (so) and splanchnopleure (sp) on the left side are positive for staining. In the embryo harboring 3′-1hsp, left-sided staining was also apparent in the PFP.