I would like to use a crystal structure of the heme group from PDB for my thesis, for the introductory topic of cofactors (Figure 2, 10.1111/j.1432-1033.2004.04411.x ). The published figure has ligands not really important that can be easily removed with a viewer. The article is free access and republishing rights are free, but do I still need permission if basically I will make my own figure on PyMol?

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