SIRT6 and endometriosis: We have also shown very strong positive correlations between SIRT3, SIRT5 and SIRT6 with YKL-40 (r = 0.743, p < 0.001; r = 0.798, p < 0.001 and r = 0.829, p < 0.001, respectively)—Supplementary Materials, Table S3, and the elevated levels of YKL-40 in sera of women with endometriosis in comparison to the healthy subjects [32].