14162
In the case of the phthalocyanine - bombesin conjugate , competition experiments confirm the involvement of the GRP receptor in both the phototherapeutic activity as well as intracellular localization .
 phthalocyanine, bombesin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 phthalocyanine, bombesin