DPP4 and obesity due to melanocortin 4 receptor deficiency: FAP2 cells demonstrated enhanced expression of the genes encoding DPP4 (Dpp4) (Supplemental Figure 2B), an adipose stem cell marker (56) that also identifies Cxcl14-negative FAPs (52, 53), and endosialin (Cd248) (Supplemental Figure 2D), an obesity-associated glycoprotein (57).