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Comparison of the refined crystal structure of the bovine αβ tubulin dimer (A) with the modeled P. dejongeii BtubA/BtubB structures (B). Each structure indicates the position of GTP and a Mg2+ ion at the intradimer active site (N-site). The hydrophobic C-terminal loop and helices are marked in magenta. Rossmann folds are marked in green.
