Mechanism of 53BP1 activity regulation by RNA-binding TIRR and a designer protein by Botuyan, MV, Cui, G, Drané, P, Oliveira, C, Detappe, A, Brault, ME, Parnandi, N, Chaubey, S, Thompson, JR, Bragantini, B, Zhao, D, Chapman, JR, Chowdhury, D, Mer, G