sentences:  Residues involved in the ligand binding having direct NOE contacts with the ligand were identified and are as follows A23, V26, L49, V26, A50, I52, W107, L114, A147, L150.These residues are wrapped around the PK11195 ligand forming a stable hydrophobic binding pocket that can be also regarded as the hydrophobic core of the complex.The mammalian TSPO in a complex with diagnostic ligand is monomeric.