1540
In addition , no significant histological change was observed in the heart of animals that received DOX in the form of HPMA copolymer conjugates and were killed at the end of the study .
 Chemical: DOX; Chemical: HPMA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: DOX; Chemical: HPMA