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
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: serine, threonine 
Answer:
 Chemical: serine; Chemical: threonine