There are multiple definitions:

1. glycogen synthetase kinase(English)

   • GSK3 aka Shaggy-like kinase
   • Abbreviation may be used in Am. Soc. Physiol. journals without definition.
   • GSK-3, GSK-3a, GSK-3β
   • Physiology

2. GlaxoSmithKline(English)

   • Health care industry