7837
Interestingly , it was recently found that the sirtuins found in various human parasites ( especially the Plasmodium , Trypanosoma , and Leishmania species ) were pro - survival for the parasites under various conditions .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None