2684
The saline - and apigenin - treated rats that did not step through into the dark compartment during the cut - off time ( 540 s ) were retested weekly for up to eight weeks .
 Chemical: apigenin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: apigenin