Commercially available primary monoclonal antibody against CD20 (clone UCHT1, Dako) was used to stain 3.0 [micro]m sections of liver biopsies after deparaffinization by routine
microwave antigen retrieval and horseradish peroxidase (diaminobenzidine) kit (DAKO, Carpinteria, CA), following manufacturer's instructions.
One or more of the following antibodies were used after
microwave antigen retrieval: Cytokeratin AE1/AE3 (CK AE1/AE3, Dako, Germany, prediluted); CD31 (Dako, Germany, 20:1000); CD34 (Dako, Germany, 10:1000); Factor VIII (Dako, Germany, 20:1000); CD68 (Dako, Germany,10:1000); and Epithelial Membrane Antigen (EMA, Dako, Germany, 5:1000).