30443
Protein kinase C ( PKC ) is a family of serine / threonine phosphotransferases ubiquitously expressed and involved in multiple cellular functions , such as proliferation , apoptosis and differentiation .
 Chemical: serine; Chemical: threonine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: serine; Chemical: threonine