C3 and obesity due to melanocortin 4 receptor deficiency: The following seven proteins are present in higher amounts in the Obesity group compared with the Control group (Figure 1): hemopexin—HPX, complement factor B—CFB, complement C3—C3, kininogen-1—KNG1, vitronectin—VTN, pigment epithelium-derived factor—SERPINF1 and beta-Ala-His dipeptidase—CNDP1.