25138
Following withdrawal of WS3 , RPE cells differentiate into a functional monolayer , as exhibited by their expression of mature RPE genes and phagocytosis of photoreceptor outer segments .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None