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Localization of sulfide oxidation pathway enzymes in human colon tissue. Immunohistochemical staining of human SQR, TST (rhodanese), and ETHE1 reveals a strongly apical (surface) localization in normal colon (a) but diffuse localization in CRC epithelium (b). The panels are shown at ×20 magnification and are representative of two independent experiments, each performed in triplicate.
