15639
Three isoforms of genes for both GPx1 ( GPx1a , 1b1 and 1b2 ) and GPx4 ( GPx4a1 , a2 and b ) have been identified .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None