21113
Using this device we determine Km and kcat for beta - galactosidase and the fluorogenic substrate Resorufin beta - d - galactopyranoside ( RBG ) to be 442 mu M and 1070 s ( - 1 ) , respectively .
 Chemical: Resorufin beta - d - galactopyranoside; Chemical: RBG
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: Resorufin beta - d - galactopyranoside; Chemical: RBG