The cDNA encoding wild-type Kdm5b was obtained from Addgene (86398)20 (link). To generate a catalytically inactive version of Kdm5b the H499A mutation was introduced by site directed mutagenesis. The in vitro transcription plasmids containing the wild-type and mutant Kdm4d were obtained from Addgene (61553, 61554)25 (link). mRNA was in vitro transcribed with T7 or T3 mMESSAGE mMACHINE kits (Ambion) and purified by LiCl precipitation. All plasmids generated in this study are available at Addgene under “Torres-Padilla lab plasmids”.