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Sequence alignment of CID based on superposition of the CID structures (PDB IDs: 2KM4, 4NAC, 4FLB, 3CLJ, 2BF0, 3D9I) using Align tool of UCSF Chimera 40. In this type of alignment, residue types are not used, only their spatial proximities. Yellow boxes highlight structured elements; red boxes show key residues responsible for the CTD recognition according to numbering of Rtt103p.
