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Molecular modeling predicts that both the short and long forms of human ALDH16A1 protein would lack catalytic activity but may interact with the hypoxanthine - guanine phosphoribosyltransferase ( HPRT1 ) protein , a key enzyme involved in uric acid metabolism and gout .
 Chemical: hypoxanthine; Chemical: guanine; Chemical: uric acid
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: hypoxanthine; Chemical: guanine; Chemical: uric acid