8729
Diverse opioids induce receptor phosphorylation at serine ( S ) 375 , present in the middle of this sequence , but opioids differ markedly in their ability to drive higher - order phosphorylation on flanking residues [ threonine ( T ) 370 , T376 , and T379 ] .
 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