FXYD3 GI:209862811 FXYD domain containing ion transport regulator 3 isoform4 precursor 1 mqkvtlgllv flagfpvlda ndledknspf yydwhslqvg glicagvlca 50 51 mgiiivmsew rssgeqagrg wgspplttql sptgakckck fgqksg