MS4A1 and cancer: These data indicate that NCD1.2 appears to have a different epitope than Rituximab since NCD1.2: (i) binds to canine and human CD20 peptide (unlike Rituximab); (ii) NCD1.2 binds to a small peptide sequence derived from human CD20 (unlike Rituximab); and (iii) Rituximab binds to human CD20+ cancer cells under conditions in which NCD1.2 is unable to compete.