Minced endometrial tissue pieces from donor mice were dispersed via surgical incision and injection into the peritoneum of GFP– host mice (14, 40–42), and treated with IgG or α-CXCR2 (2.5 mg/kg in 1× PBS, bidiurnally) with pretreatment beginning 6 days prior to endometriosis induction. Here, CXCR2 is linked to endometriosis.