A, representative examples of the voltage responses of PV+BCs, PV+AACs, CCK+BCs and CCK+DTIs to increasing depolarizing and hyperpolarizing current steps. B, hierarchical clustering based on 40 different electrophysiological features revealed two separate clusters, corresponding almost perfectly to PV+ (black) and CCK+ (purple) cells (left). Reclustering only PV+ cells can reasonably but not perfectly separate PV+BCs from AACs (right).