DLK1 and obesity due to melanocortin 4 receptor deficiency: Additionally, the expression of DLK1, which has been reported as a major inhibitor of adipogenesis, was consistently higher in the maternal segment than in the fetal segment (Figure S14a,b, Supporting Information).[31] This illustrates that WJ‐MSCs derived from the maternal segment may provide a better model of therapeutic intervention for obesity and related diseases.