Fig. 4

MS spectrum of the (a) γ, (b) β and (c) α chains. The charge states of the major ions are presented above the m/z value. The lack of homogeneity indicates the presence of isoforms
MS spectrum of the (a) γ, (b) β and (c) α chains. The charge states of the major ions are presented above the m/z value. The lack of homogeneity indicates the presence of isoforms