26051
Statistical and diblock copolymers of N - ( 2 - hydroxypropyl ) methacrylamide ( HPMA ) , oligolysine , and oligohistidine were synthesized via reversible - addition fragmentation chain transfer ( RAFT ) polymerization , and tested for in vitro transfection efficiency , buffering ability , and polyplex uptake mechanism via the use of chemical endocytic inhibitors .
 Chemical: N - ( 2 - hydroxypropyl ) methacrylamide; Chemical: HPMA
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: N - ( 2 - hydroxypropyl ) methacrylamide; Chemical: HPMA