2561
The proposed systems present important properties for the delivery of macromolecules in a biological medium , as they are formed by substances that have absorption - enhancing and fusogenic effects ; additionally , they facilitate entrapment by cellular membranes due to their nano - scale structure .
 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