21457
Structural Explanation for Allolactose ( lac Operon Inducer ) Synthesis by lacZ beta - Galactosidase and the Evolutionary Relationship between Allolactose Synthesis and the lac Repressor .
 Chemical: Allolactose; Chemical: Allolactose
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: Allolactose; Chemical: Allolactose