F990F365B0201269D237AFE66EAF96469A91CC341679A9A112A5E8C8B22C57B711E01A1911739D471F0A68C2B56DFEF1

Hyperphosphorylation at Ser-13 occurs during the early stages of apoptosis but becomes less prominent during the later stages. Phosphorylation at Ser-13 also increases in response to stress brought on by cell injury (By similarity).

Source:http://purl.uniprot.org/SHA-384/F990F365B0201269D237AFE66EAF96469A91CC341679A9A112A5E8C8B22C57B711E01A1911739D471F0A68C2B56DFEF1