1527
There was a marked increase in the number of TUNEL positive cells and nestin positive cells in BCNU - exposed group , but a decreased immunoreactivity to glial fibrillary acidic protein , synaptophysin and transforming growth factor beta1 was observed , indicating a delayed maturation , and melatonin significantly reversed these changes .
 Chemical: BCNU; Chemical: melatonin
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: BCNU; Chemical: melatonin