12
We also show that platelet-activating factor from 10(-12) to 10(-6) M induced rapid and significant elevation in intracellular calcium levels , whereas lyso- platelet-activating factor was again ineffective.
 protein: platelet-activating factor; protein: platelet-activating factor
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: platelet-activating factor; protein: platelet-activating factor