10716
Here , we tested MNU at 10 - fold lower concentrations than a previous study and report a NOGEL of 0 . 0075 micro g / ml ( 72 . 8nM ) in human lymphoblastoid cells , quantified through the hypoxanthine ( guanine ) phosphoribosyltransferase assay ( OECD 476 ) .
 Chemical: MNU; Chemical: hypoxanthine; Chemical: guanine
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: MNU; Chemical: hypoxanthine; Chemical: guanine