23165
In the present study , we investigate whether fluorescent core - shell PMMA nanoparticles ( FNPs ) post - loaded with a photosensitizer , namely meso - tetrakis ( 4 - sulfonatophenyl ) porphyrin ( TPPS ) and uploaded by MSC could trigger osteosarcoma ( OS ) cell death in vitro upon specific photoactivation .
 meso - tetrakis ( 4 - sulfonatophenyl ) porphyrin, TPPS
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 meso - tetrakis ( 4 - sulfonatophenyl ) porphyrin, TPPS