在pACYC质粒上吧。
Rosetta(DE3) This is a BL21 derivative designed to enhance the expression of
eukaryotic proteins that contain codons rarely used in E. coli. These
strains supply tRNA genes for AGG/AGA (Arg), AUA (Ile), CUA (Leu), CCC (Pro)
and GGA (Gly) on a ColE1 compatible chloramphenicol-resistant plasmid. Thus
the Rosetta strains provide for "universal" translation which is otherwise
limited by the codon usage of E. coli.
Available from Novagen