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Which of these is not a part of the tri protein complex in homologous DSB repair?

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Which of these is not a part of the tri protein complex in homologous DSB repair?

(a) MRE11

(b) NBS1

(c) RAD 51

(d) RAD 50

I have been asked this question in an interview for internship.

My enquiry is from Repair of DNA Damage: Recombinational and Bypass in division DNA Mutation, DNA Repair, Transposable Elements of Cytogenetics

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Right choice is (c) RAD 51

To elaborate: The MRN complex or the tri protein complex that can recognize the DSB consists of MRN11, NBS1 and RAD 50. Rad 51 is a eukaryotic homologue of Rec A which guides the strand to invade the other homologue.

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