To determine the effect of neutrophils on endometrial tissue attachment and initiation of endometriosis-like lesion formation (herein called lesions), donor mice expressing GFP were treated with control IgG or α-CXCR2 antibody (2.5 mg/kg in 1× PBS, bidiurnally) 5 days prior to donor endometrial tissue removal to knock down neutrophil recruitment (Figure 2). Here, CXCR2 is linked to endometriosis.