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. Author manuscript; available in PMC: 2018 Jul 10.
Published in final edited form as: EcoSal Plus. 2009 Aug;3(2):10.1128/ecosalplus.3.6.3.7. doi: 10.1128/ecosalplus.3.6.3.7

Figure 21.

Figure 21

(A) X-ray crystal structure of the TPP-binding riboswitch with bound TPP (PDB accession no. 2GDI). (B) Detailed view of the TPP binding site with magnesium ions depicted as green spheres and water molecules depicted as red spheres.