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Pro-COL11A1 expression in breast papillary lesions. Immunostaining for pro-COL11A1 in: (a) benign intraductal papilloma, (b) malignant relapse intraductal papilloma, (c) encapsulated papillary carcinoma. Counterstain with Hematoxilin. Lowercase letters images magnification ×200, uppercase letters images magnification ×400.
