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Furthermore , increased permeability of the RWM from acoustic cavitation of MBs could also be visualized immediately following ultrasound exposure by using Alexa Fluor 488 - conjugated phalloidin as a tracer .
 Alexa Fluor 488, phalloidin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Alexa Fluor 488, phalloidin