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Criteria for the semi-quantitative evaluation of γH2AX staining by immunohistochemistry on mouse mammary tumors.
| Negative | Weak punctate staining encompassing <50% of the nucleus of <50% of neoplastic cells |
| Weak positive | Moderate to strong punctate staining encompassing <50% of the nucleus of 50–75% of the neoplastic cells |
| Strong positive | Moderate to strong punctate staining encompassing up to 90% of the nucleus of >75% of neoplastic cells |
