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Nucleotide and amino acid alignment of sgtF1b and sgtF4 X gene/protein. The location of Enhancer II (ENII; nt 1627–1774) and Core Promoter (CP, 1575–1849), that overlap the X gene are shown. The CP comprises a negative regulatory element (NRE, nt 1613–1636), a core upstream regulatory sequence (CURS, nt 1636–1742) and the basal core promoter (BCP; nt 1743–1849).
