14399
Shorter UGT1A isoforms [ isoform 2 ( i2 ) ] are deficient in glucuronic acid transferase activity but function as negative regulators of enzyme activity through protein - protein interaction .
 glucuronic acid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 glucuronic acid