However, differential expression of the toxic granules (granzyme B, perforin, and granulysin) and surface receptors (NKG2D, NKp30, NKp46, CD158a, and CD158b) of peripheral NK cells between females with or without endometriosis was not observed in our study (Supplementary Figure S3). This evidence concerns the gene KLRK1 and endometriosis.