Fig. 2From: Reanalysis of a μ opioid receptor crystal structure reveals a covalent adduct with BU72Clashes and unexplained density between BU72 and His54 in the original model (PDB 5C1M v.1.5 [8]). 2Fo-Fc density (blue) and Fo-Fc omit density (green) are shown at the indicated levels. Clashing N atoms are shown as spheresBack to article page