CCL21 and endometriosis: In total we have identified seven potential biomarkers for peritoneal endometriosis (i.e. CCL21, CCL11, CCL26, CX3CL1, CCL1, IL-6, and CCL3), two for the presence of peritoneal and ovarian endometriosis (i.e. CXCL11, CXCL12), one for peritoneal and deep infiltrating endometriosis (i.e. IFN-γ) and two for all three types of endometriosis (i.e. CCL15, CXCL12).