Immunocytochemical staining using anti-CD44v6 peptide antibodies on CD44v6 positive U937 cell line. (A) No antibody (negative control). (B) Irrelevant antibody (negative control). (C–H) Anti-CD44v6 antibody clones 1H1, 1H2, 2A12, 2G11, 3H3 and 3H7, respectively. DAPI was used for the nuclei staining and FITC-conjugated (green) secondary antibody for immunoflourescence staining (magnification, 200×).