2PEET N M,MCKEATING J A,SOUZA J B.The effect of low-profile serine substitutions in the v3 loop of HIV-1 gp120Ⅲ B/LAT on the immunogenicity of the envelope protein[J].Virology,1998,251(1):59-70.
3ZHOU Ji-yong,WANG Jin yong,CHEN Ji-gang,et al.Cloning,in vitro expression and bioactivity of duck interleukin-2[J].Mol Immunol,2005,42(5):589-598.
4WILLIANS D P,REGIER D,AKIYOSHI D,et al.Design synthesis and expression of a human interleukin-2 gene incorporating the codon usage bias found in highly expressed Escherichia coli genes[J].Nucleic Acids Res,1998,16(22):10453-10467.
5SEOW H F,MUCHA M J,HURST L,et al.Expression of ovine interleukin-2 cDNA in Escherichia coli[J].Vet Immunol Immuno pathol,1997,56(1/2):107-117.
6STEPANIAK J A,SHUSTER J E,HU W,et al.Production and in vitro characterization of recombinant chicken IL-2[J].J Inter feron Cytokine Res,1999,19(5):515-526.
7MOSMAN.Rapid colorimetric assay for cellular growth and survival:application to proliferation and cytotoxicity assays[J].J Immunol Methods,1983,65(1/2):55-63.
