Detection of Human CD31 by Immunofluorescence. Sample: FFPE section of human breast carcinoma. Antibody: Affinity purified rabbit anti-CD31 (Cat. No. IHC-00055) used at a dilution of 1:100. Detection: Red-fluorescent goat anti-rabbit IgG-Hilyte PlusTM 555 (Cat. No. A120-501E).