25991
We solved the crystal structures of tau 55 - HPD and its closely related paralogue Huf and used in silico docking methods to identify phospho - serine and phospho - tyrosine containing peptides as possible substrates that were subsequently validated using in vitro phosphatase assays .
 Chemical: phospho - serine; Chemical: phospho - tyrosine
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: phospho - serine; Chemical: phospho - tyrosine