19806
We demonstrate that Photofrin preferentially interacts with PLL - g - PEG through both ionic and hydrophobic interactions .
 Chemical: Photofrin; Chemical: PLL - g - PEG
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Photofrin, PLL - g - PEG 
Answer:
 Chemical: Photofrin; Chemical: PLL - g - PEG