MW: 11.8kDa (110aa) confirmed by MALDI-TOF. Purity >95% by SDS-PAGE. SEPW1 is a selenoprotein, which contains a selenocysteine (Sec) residue at its active site. The selenocysteine is encoded by the uGA codon that normally signals translation termination. The 3' uTR of selenoprotein genes have a common stem-loop structure, the sec insertion sequence (SECIS), that is necessary for the recognition of uGA as a Sec codon rather than as a stop signal. This protein shows highest expression in skeletal