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Two comparative examples of YY1 expression in osteosarcomas. A, osteobastic osteosarcoma specimen with 2 as score of immunoreactivity to YY1 at lower magnification (20x); B, the same specimen as in A at higher magnification (100x); C, osteoblastic osteosarcoma specimen with 4 as score of immunoreactivity to YY1 (20x); D, the same osteoblastic osteosarcoma specimen as in C at higher magnification (100x). YY1 protein was localized in nuclei of the cells.
