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Contribution of mannose-binding lectin (MBL) and ficolins to phagocytosis of green fluorescent protein (GFP)-tagged Mycobacterium tuberculosis (MTB) H37Rv bacteria by U937 cells, differentiated to macrophages with phorbol myristate acetate (PMA). Data from flow cytometry (mean ± standard deviation from at least four experiments). C: controls (bacteria not opsonized with MBL or ficolins). *P < 0·05; **P < 0·01.
