24631
However , these analyses have been performed using short peptides comprising phosphotyrosine followed by a few amino acids , which are described as the canonical recognition sites .
 Chemical: phosphotyrosine; Chemical: amino acids
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: phosphotyrosine, amino acids 
Answer:
 Chemical: phosphotyrosine; Chemical: amino acids