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Ser / Thr protein phosphatase 1 ( PP1 ) is a single - domain hub protein with nearly 200 validated interactors in vertebrates .
 Chemical: Ser; Chemical: Thr
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: Ser; Chemical: Thr