I'm conducting a human imaging study with [11C]PBR28, a TPSO PET ligand, and am considering including subjects who are prescribed benzodiazepine medications. I am familiar with the 2013 Synapse publication by Kalk et al. that analyzed binding affinities of several benzos to TSPO in post-mortem human brains, but unfortunately they compared a limited range of benzodiazepines. I was wondering if anyone knew of any additional information or studies that included a larger range of benzos (e.g. alprazolam). Thanks!