BptfXG023, BptfFloxedNeo, BptfFloxed, and BptfΔexon2 embryos on a B6/129 mixed background have been cryopreserved at the Cryopreservation and Assisted Reproduction Lab, National Cancer Institute, Frederick (MD, USA) as BPTFXG023, BPTFFloxedNEO, BPTFFloxed and BPTFdel-exon2 respectively. These mouse lines are available to the research community by request.