Dear All We use the Dakocytomation (M0784) CD21 with 10mins Protease AR on the Ventana Nexes - IVIEW DAB. We get epthelial staining as well as the expected pattern of staining. The spec sheet states that this does occur. The problem is our path's are not happy. Is anybody using HIER. If yes what dilutions are used? Thanks for all answers. Heather