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The keratinocytes and mammary breast cells ( cancer and normal ) were incubated with platinum folate nanoparticles , and the results showed that the IC50 was significantly higher for the normal cells than the cancer cells in both cases , indicating that these nanoparticles preferentially target the cancer cells .
 platinum folate
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 platinum folate