You isolated a gene expressed in differentiated neurons in mice. You then fused various fragments of the gene (shown as dark lines in the following figure) to a GFP reporter lacking either enhancers or a promoter. The resulting clones were introduced into neurons in tissue culture, and the level of GFP expression was monitored by looking for green fluorescence. From the results that follow, which region contains - the promoter and a neuronal enhancer? Regulatory region of nerve gene GFP GFP expression Fragments fused to GFP 80 ab c d e 19

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