18046
The prototypic redox - regulated targets downstream of ROS are the protein tyrosine phosphatases , and the wealth of research that has focused on this area has come to shape our understanding of how redox - signalling contributes to and facilitates protein tyrosine phosphorylation signalling cascades .
 Chemical: tyrosine; Chemical: 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: tyrosine; Chemical: tyrosine