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Promoters based on the ACTA1/HSA gene. (A) – the full-length HSA promoter includes the distal region, the proximal region (PR), and the basal region, which consists of the noncoding exon (+1...+90) and the first intron fragment (+91...+239); (B) – shortened version of the HSA promoter; (C) – the chimeric HSA/CMV promoter consisting of a fragment of the HSA promoter and the CMV promoter
