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Structure of apo-mTREX2. (A) Overall structure of apo-mTREX2. The two TREX2 protomers are colored yellow and purple. The loop region (159 a.a.-167 a.a) between the seventh and eighth α-helix (α7 and α8 helix) is disordered in the structure. (B) Active sites superposition of mTREX2, RNase T (PDB entry: 4KB0) and Exo X (PDB entry: 4FZX). The residues of RNase T and Exo X are colored green and blue, respectively.
