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Fig. 2. Identification of the e15 enhancer element within the egl-15 promoter. egl-15 promoter fragments, from 2.0 kb to 0.8 kb, were used to drive expression of the clr-1 genomic coding region. Rescue assays were performed in a clr-1(e1745ts) background. Rescue activity is classified as strong (++), intermediate (+), weak (+/–), or no rescue (– –). n, the total number of transgenic lines scored. The location of the egl-15 enhancer (e15, from –1530 to –1296) lies between the dashed lines.