C4A and tuberculosis: Furthermore, active TB was associated with increased levels of immunoglobulins, proteins associated with infiltration of neutrophils (MMP8, DEFA3, PRTN3), complement cascade members (C1QB, C1R, C1RL, C1S, C3, C4A, C5, C8A), and proteins playing a role in blood coagulation (F5, F13B, VWF, FGG, FGB, GP1BA).