English: RAD21 has three binding domains that interact with corresponding protein: SMC3 (1–103aa), STAG1/2 (362–403aa) and SMC1A (558–628aa); a LPE motif (255-257aa): required for rapid and specific cleavage of RAD21 by Separase; two bipartite nuclear localization signals (NLS) (317-399aa and 384-407aa) predicted by cNLS Mapper (http://nls-mapper.iab.keio.ac.jp/); one alternating acidic-basic residues stretch (524-533aa); one acidic residues stretch (534-543aa); four cleavage sites: two Separase cleavage sites (ExxR), one Calpain-1 cleavage site (LLL) and one Caspase-3/7 site (DxxD). The numbers indicate the location of amino acid residue on human RAD21. The arrow shows the site where it is cleaved.