503
Arg - 130 , Gly - 132 and Lys - 167 are conserved in all members of the type IB topoisomerase family .
 GENE: type IB topoisomerase family
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: type IB topoisomerase family