3678
We further show that ubiquitination of cell - surface OAT1 increases in cells transfected with dominant negative mutant of dynamin - 2 , a maneuver blocking OAT1 internalization , which suggests that OAT1 ubiquitination proceeds before OAT1 internalization .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None