4445
Brain tissues were collected and analyzed by western blot , enzyme immunoassay , spectrophotometric assays and terminal deoxynucleotidyl transferase - mediated dUTP end - labeling ( TUNEL ) staining .
 Chemical: deoxynucleotidyl; Chemical: dUTP
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: deoxynucleotidyl; Chemical: dUTP