The concentration of TGF-β2 was 2630.55 ± 550.90 pg/ml in AH samples of the DMC group and 2281.39 ± 681.72 pg/ml in AH samples of the ARC group; the differences between the two groups were statistically significant (P value = 0.023) (Fig. 1b). Here, TGFB2 is linked to Dyggve-Melchior-Clausen disease.