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Klf8 has two alternative promoters. A, schematic diagram of alternative Klf8 exons. Alternative start points of transcription at exons 1a and 1c and the start point of translation in exon 2 are shown. Intron lengths are given below. B and C, sequences of exon 1a (B) and exon 1c (C) and the region 1 kb upstream of the start of each exon. The start of each exon is given as +1. The exons are shown in bold type. Klf consensus sites (NCN CNC CCN) upstream of each exon are boxed.
