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Assessment of CYB5R1 staining in a collection of 221 primary colorectal cancers. Tumors were assigned scores from 0 (no CYB5R1 staining) to 3 (strong CYB5R1 staining in most tumor cells). Arrows indicate CYB5R1 staining in tumor cells at the infiltrative edge. Images in lower panels show higher magnifications of the areas boxed in upper panels.
