This locus encodes an AT-rich DNA interacting domain-containing protein. The encoded protein is a component of the SWI/SNF chromatin remodeling complex and may play a role in cell-cycle activation. The protein encoded by this locus is similar to AT-rich interactive domain-containing protein 1A. These two proteins function as alternative, mutually exclusive ARID-subunits of the SWI/SNF complex. The associated complexes play opposing roles. Alternative splicing results in multiple transcript variants.,ARID1B,6A3-5,BAF250B,BRIGHT,CSS1,DAN15,ELD/OSA1,MRD12,OSA2,P250R,Epigenetics & Nuclear Signaling,Chromatin Remodeling,ARID1B