19808
In tumor - bearing mice , formulation of Photofrin with PLL - g - PEG enhanced tumor localization of Photofrin as twice as Photofrin alone and concomitantly suppressed the photosensitivity reaction drastically .
 Chemical: Photofrin; Chemical: PLL - g - PEG; Chemical: Photofrin; Chemical: Photofrin
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: Photofrin; Chemical: PLL - g - PEG; Chemical: Photofrin; Chemical: Photofrin