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Comparison of immunohistochemical staining for ECE and ET-1 in rat thoracic aorta (left) and vena cava (right). Sections were incubated with primary antibody (ECE or ET-1), primary antibody quenched with a 5x (weight/weight) excess of competing peptide (+ CP), or no primary antibody (no primary). Arrows indicate immunohistochemical staining and sections to be compared with CP. Representative of five (5) separate animals. L = lumen.
