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Derivatives of Rhodococcus expression vector pRESX used in this study for expression of kshA2 (pKSH312) and kshA2 and kshB (pKSH313) in gene deletion mutants of R. erythropolis SQ1. The pRESX vector contains the kstD1 promoter region providing constitutive gene expression in R. erythropolis (unpublished data).
