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Protein phosphatase type 2A ( PP2A ) enzymes constitute a large family of Ser / Thr phosphatases with multiple functions in cellular signaling and physiology .
 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