X-ray crystal structure of Erthythromycin bound to Cytochrome-P450 3A4. Model created from the depositied structure in the RSCB PDB Database 2V0M. Original work: "Structural basis for ligand promiscuity in cytochrome P450 3A4", Marika Ekroos and Tove Sjogren, PNAS (2006) 103(37), pp. 13682-13687. Note: A portion of the CYP3A4 backbone was deleted to better enable the Cytochrome and Erythromycin to be seen.