This strain was establishe by CRISPR-Cas9 system at Osaka University. Target sequence is CCATGGGGGTGTTGATGTCCAAG (CCA is PAM sequence). Back ground strain is Crlj:Wistar (WI). This strain is line No. 11 and has a 128-bp deletion in Phf24 gene. Off-target effects (214 candidate region) have not yet been examined.