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The proviral insertion site in Moloney murine leukemia virus , or PIM proteins , are a family of serine / threonine kinases composed of three different isoforms ( PIM1 , PIM2 , and PIM3 ) that are highly evolutionarily conserved .
 Chemical: serine; Chemical: threonine
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: serine; Chemical: threonine