4.2.3.120 expression in Escherichia coli 4.2.3.120 integrative volatile terpenoid profiling and transcriptomics analysis for mining the corresponding genes involved in volatile terpenoid biosynthesis, overview 4.2.3.120 recombinant expression of GST-tagged S-limonene synthase mutant in Escherichia coli strain BL21(DE3), subcloning in Escherichia coli strain DH5alpha