MKRLHLDDEKSSNLGEMVRVGEGKYREDFQMDEGEDPNLLFQSYLDNVGVQIVRQMRSGERFLKIWSQTVEEIVSYVTVNFPNPPRRSSEDKSTQTTGRELKKETTSAFSQRESQPSKARMVAQVAPGPPALEWSATNEEDDLSVEAEIAHQIAESFSKKYKFPSRSSGIFLYNFEQLKMNLDDIVKEAKNVPGVTRLAHDGSKIPLRCVLGWVALANSKKFQLLVEADKLSKIMQNDLNRYTSS
D289N, C297S mutant of phosphoprotein (Isoform P3). Amino acid numbering is relative to the canonical isoform 1 sequence in UniProt P22363. Isoform 3 differs from the canonical sequence in that amino acids 1-52 are missing.