Fig. 1.

AKT1 5′ RACE transcripts in human muscle identify preferential use of upstream promoter. RefSeq transcripts for AKT1 from the UCSC genome browser (a) as well as the results of our RACE analysis on the 5′ end of AKT1 (b). The initial exon of the AKT1 gene in human muscle was identified through 5′ RACE. Seven products were sequenced, with six (N = 6) showing a first exon (Exon 1A) corresponding to RefSeq NM_001014431.1 (a) and one corresponding (N = 1) (b) to an alternative promoter closer to exon 2 (Exon 1B from a)