13717
These experiments allowed us to identify ( i ) polyplex - external cell membrane binding , ( ii ) free , unbound polylysine coexisting with polyplexes as well as ( iii ) polymer buffer capacity as three possible factors that may contribute to the superior transfection properties of the hyperbranched polylysines as compared to their linear and dendritic analogs .
 Chemical: polylysine; Chemical: polylysines
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: polylysine; Chemical: polylysines