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In addition , combination treatment of primary CLL cells with P505 - 15 plus fludarabine produced synergistic enhancement of activity at nanomolar concentrations .
 Chemical: P505 - 15; Chemical: fludarabine
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: P505 - 15; Chemical: fludarabine