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(A) Map of the ectoine and hydroxyectoine biosynthesis genes of H. elongata (ect) and S. chrysomallus (thp). The thpD gene coding for the S. chrysomallus ectoine hydroxylase, which was transferred to H. elongata, is shown in black. (B) Mobilizable pHE1-derived shuttle vectors for the expression of the S. chrysomallus thpD gene in H. elongata. The ectA promoter region is indicated by small arrows.
