Assertion: caspase | /r/HasProperty | required for dna fragmentation
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Source sentences:
text: p53 appears to be required for methotrexate-induced senescence, but not apoptosis, caspase 3 is required for DNA fragmentation and the morphological changes associated with apoptosis, while neither p53 nor caspase 3 are required for methotrexate-induced growth arrest.