4201
VDAs can be divided into biologics , such as ligand - based , and small - molecule agents ; this second group includes small - molecule VDAs like flavonoids , such as 5 , 6 - dimethylxanthenone - 4 - acetic acid ( DMXAA ) , and microtubule - destabilizing agents .
 microtubule
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 microtubule