Arabinogalactan composition of a Rv3779 knock-out mutant of M. tuberculosis H37Rv. CE-LIF analysis of the AG prepared from M. tuberculosis H37Rv wild-type (trace 1), the Rv3779 knock-out mutant (trace 2), and the complemented mutant strain, H37RvΔRv3779/pVVRv3779 (trace 3). I, d-Araf-APTS; II, d-Galp-APTS; III, d-GalNp-d-Araf-d-Araf-APTS.