APOA4/Apo-AIV expression in Mouse Colon analyzed by immunohistochemistry. Tissue was paraffin-embedded, and antigen retrieval was achieved by steaming in citrate buffer, pH 6. Staining was performed with Anti-APOA4/Apo-AIV Antibody (A84590) at 2µg/ml and revealed with horseradish peroxidase (HRP).