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Immunohistochemical Analysis of BRCA1 in Breast Carcinomas. The photographs show (a) negative control showing no detectable BRCA1 immunoreactivity in which BRCA1 antibody has been replaced with isotype specific IgG with score 0 (b) weak expression with score 1-4 (c) moderate expression with score 5-8 and (d) strong expression with score 9-12; (A-D, original magnification ×200).
