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Immunohistochemical detection of Pit-1 and PRL expression in human breast tissue. (A) Representative set of negative and positive (1+, 2+, and 3+) PRL and Pit-1 immunodetection in human breast invasive ductal carcinomas. (B) Human pituitary gland was used as positive control to detect PRL and Pit-1 immunopositivity. Original magnification ×20.
