30190
Proline - rich tyrosine kinase 2 ( Pyk2 ) is activated by various agonists in platelets .
 Chemical: Proline; 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: Proline; Chemical: tyrosine