Two new knock-in mouse lines are now available from the Jackson Laboratory. David Leib generated the Bdnf-2a-Cre mouse line (JAX #030189), and Hongkui Zeng’s group at the Allen Institute for Brain Science generated the Adcyap1-2a-Cre mouse line (JAX #030155). Both mouse lines were described in Chan’s recent paper (doi:10.1016/j.cell.2016.08.028).