18508
By transforming immune cells into pro - and anti - inflammatory chemokine - and cytokine - producing units , and by guiding the interactions between the different immune cells , the immune system decisively influences the propensity of a given plaque to rupture and cause clinical symptoms like myocardial infarction and stroke .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None