GPX5 GI:6715602 glutathione peroxidase 5 isoform 2 precursor 1 mttqlrvvhl lplllacfvq tspkqekmkm dchkdekgti ydyeaialnk 50 51 neyvsfkqyv gkhilfvnva tycgltaqyp gmsvqgedly lvssflrkgm 100