9LAVALLIE E R, MCCOY J M.Gene fusion expression sys- tems in Escherichia coli [J]. Curr Opin Biotechnol, 1995,6(5):501 -506.
10LIN J I E, LIU JIAN JUN, LU MIN NAN, et al. High-lev- el soluble expression, purification, and functional charac- terization of the recombinant human leukemia inhibitory factor: a potential general strategy for the recombinant ex- pression of cytokines consisting of four alpha-helices in a bundle[J]. Protein Pept Lett,2011,18(7):690-698.