CCK and Anxiety: The present pilot analyses testing different GABA-interneuron markers indicate that Cck- and Sst- but not Pvalb- expressing interneurons are expressing Cyp19a1. Cck-interneurons in the amygdala and Sst-interneurons in limbic regions, where the current study found indication for co-expression with Cyp19a1, might play a role in the response and modulation of anxiety in rodents [54, 55].