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. 2013 Jan 16;3(1):75–84. doi: 10.3390/biom3010075

Figure 1.

Figure 1

The checkpoint clamp (Rad9-Husl-Radl) complex plays various roles in DNA damage response pathways. The C-terminal tail of Rad9 is required for Chk1 activation through interaction with TopBP1. In addition to the role in checkpoint activation, the checkpoint clamp functions in multiple DNA repair pathways such as translesion synthesis and base excision repair.