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Sxl‐dependent alternative polyadenylation of enhancer of rudimentary mRNA. Activation of the proximal poly(A) site (proximal pA) requires the binding of CstF to a downstream RNA sequence (red). Sxl can compete with and displace CstF‐64, diverting it to a downstream site. This results in activation of a distal polyA‐site (♀ pA) and an extended 3′ UTR in female flies.
