11954
These nanoparticles were internalized into ARPE - 19 ( human RPE cell line ) via receptor - mediated endocytosis , and the cellular uptake was significantly higher than particles without folate modification .
 folate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 folate