Recently, Glykys et al., 2007, demonstrated that the δ subunit can pair with the α1β in hippocampal interneurons, based on co-localization with immuno-staining, electropharmacological properties and changes in knockout mice. While this single report is convincing, we decided that this subtype did not meet sufficient criteria to be included in the list of “identified” subtypes. We therefore included the α1βδ receptor on the category B list, “identified with high probability”.
