Re: MALDI problem with expressed protein# Biology - 生物学m*h2003-04-07 07:041 楼160 Da difference ? N-terminal phosphogluconoylated: (178 Da 258 Da difference)Anal. Biochem. 1999, 267 169-184M-terminal mythylation:Protein Sci. 1995 , 4, 2616-2618