Provided herein are (a) Aiolos gene, Aiolos polypeptides, Aiolos homodimers, Aiolos/Ikaros heterodimers and methods of using Aiolos nucleic acids and polypeptides; (b) Helios gene, Helios polypeptides, Helios homodimers, Helios/Ikaros heterodimers, Helios/Aiolos heterodimers, and methods of using Helios nucleic acids and polypeptides; (c) Daedalos nucleic acids, Daedalos polypeptides, and other related molecules and methods of making and using the same; and (d) Ikaros regulatory elements and uses thereof.