19706
By contrast , no differences in the extent of platelet aggregation were observed between ABLP platelet - rich plasma ( PRP ) and control PRP , suggesting the presence of a protective factor in ABLP plasma .
 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