CXCL11 and neoplasm: Notably, CXCR3, the main receptor of CXCL11, is expressed on the surface of NK cell line NK-92MI.21 To confirm CXCL11‘s role in mediating the enhanced NK cell migration induced by media from butyrate-treated tumor cells, we added a CXCR3-neutralizing antibody to the conditioned media.