However, properdin, C3d and C5b-9 levels were not correlated with MBL levels in HD patients (Properdin/MBL, r = 0.049, P = 0.6; C3d/MBL, r = −0.031, P = 0.7; C5b-9/MBL, r = −0.051, P = 0.6). The gene discussed is MBL2; the disease is Huntington disease.