7886
Polyplexes of block copolymers were stable against aggregation in physiological salt condition and in Opti - MEM due to the shielding effect of P ( HPMA ) and P ( OEGMA ) .
 Chemical: P ( HPMA ); Chemical: P ( OEGMA )
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: P ( HPMA ); Chemical: P ( OEGMA )