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Expression of PLK1 and PCNA in colorectal tissues. (A) PLK1 negatively expressed in normal colorectal tissues; (B) PLK1 moderately expressed in colorectal cancer tissues; (C) PLK1 strongly expressed in colorectal cancer tissues; (D) PCNA negatively expressed in normal colorectal tissues; (E) PCNA moderately expressed in colorectal cancer tissues; (F) PCNA strongly expressed in colorectal cancer tissues. Original magnifications ×200.
