FIGURE 3.

A, MALDI-TOF mass spectrum of the fraction enriched in galactosaminylated arabinans (after acetylation) released by endogenous arabinase from the cell wall core (mAGP) of M. leprae. Both M + Na⁺ and, at 16 atomic mass units higher, M + K⁺ ions are seen. The galactosaminylated species released are a series running from Ara₁₇GalNH₂ through Ara₃₁GalNH₂. B, expansion of the spectrum from m/z 5500 to m/z 7200 showing more clearly Ara₂₄GalNH₂ through Ara₃₁GalNH₂. The fragments are formed as in the illustration shown in Fig. 2B except succinyl is replaced by GalNH₂.