1. This phosphorylation is added onto the glycogen phosphorylase b serine 14. 2. PRTN3 is a serine protease enzyme expressed mainly in neutrophil granulocytes. 3. Serine is formed from 3-phosphoglycerate in the following pathway:4. L-Serine dehydratase condenses homocysteine with serine to form cystathionine. 5. L-Serine dehydratase condenses homocysteine with serine to form cystathionine. 6. It catalyzes its autophosphorylation on serine / threonine and tyrosine residues. 7. Matriptase is an epithelial-derived, integral membrane serine protease. 8. Kallikreins are a subgroup of serine proteases having diverse physiological functions. 9. Cytokine-inducible kinase is a putative serine / threonine kinase. 10. MACF1 has 6 serines , which are possible GSK3? phosphorylation sites.