16642
Metallothionein 1A polymorphisms may influence urine uric acid and N - acetyl - beta - d - glucosaminidase ( NAG ) excretion in chronic lead - exposed workers .
 Chemical: uric acid; Chemical: N - acetyl
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: uric acid; Chemical: N - acetyl