15512
A Serum - Resistant Low - Generation Polyamidoamine with PEI 423 Outer Layer for Gene Delivery Vector .
 Chemical: Polyamidoamine; Chemical: PEI 423
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: Polyamidoamine; Chemical: PEI 423