UCN2 and obesity due to melanocortin 4 receptor deficiency: Overall, significant negative correlations were observed for UCN1 expression and obesity markers (BMI, percentile, body fat percentage, and cholesterol), for UCN3 and TNFα and NGAL, as well as for CRH and TNFα, RBP4, ZAG, and circulating UCN2 levels (p < 0.05).