In girls with CPP, baseline serum concentrations of DLK1 were slightly higher than in age-matched healthy girls: 13.1 (7.1-18.4) ng/mL (n = 13) vs 9.3 (6.9-14.8) ng/mL (n = 10), P = .030 (Fig. 1), but the concentrations were not affected by GnRHa treatment (Fig. 3). The gene discussed is DLK1; the disease is central precocious puberty.