CD1B and tuberculosis: Additional work will look at whether DN1 or other group 1 CD1-restricted T cells can functionally act as Tfh cells to provide B cell help, as may be suggested by the existence of IgG antibodies against MA and glycolipid lipoarabinomannan in TB patients (Correia-Neves et al., 2019; Schleicher et al., 2002; Pan et al., 1999).