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Which of the following is not a sensor of DSB?

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Which of the following is not a sensor of DSB?

(a) Ku

(b) P21

(c) H2AX

(d) P53

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Query is from Repair of DNA Damage: Recombinational and Bypass topic in portion DNA Mutation, DNA Repair, Transposable Elements of Cytogenetics

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The correct answer is (b) P21

For explanation: P53 is associated with DSB as ATM kinase phosphorylates 53BP1 that on activation codes for P53. On the other hand P21 is not associated with DSB. Ku and H2AX the non-canonical base is also associated with DSB repair.

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