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A novel splice variant of UGT2A2 lacking exon 3 ( termed UGT2A2 Delta exon3 ) was investigated , with UGT2A2 Delta exon3 expression determined to be 25 - 50 % that of wild - type UGT2A2 in all tissues examined .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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