pCAGGS-HA质粒是在pCAGGS载体的基础上添加了HA标签,利于在WB实验的时候用抗体检测。This plasmid is useful for highly efficient expression of genes under the control of the AG promoter and the human CMV-IE enhancer in various mammalian cells.The AG promoter sequence consists of the chicken β-actin promoter, the first exon and part of the first intron (that seems to have a strong enhancer-like activity) linked to a rabbit β-globin fragment, consisting of a 3' part of the second intron (inclusive a branch point which is required for normal splicing reactions) and a 5' part of the third exon.When cloning a fragment downstream from the lac promoter it may be advisable to use lacIq strains in order to prevent fortuitous expression of a possibly noxious polypeptide.