18691
This communication describes a very simple , rapid and inexpensive point - of - care diagnostic test for sickle cell disease ( SCD ) that can conclusively differentiate between blood samples from normal healthy individuals , sickle cell trait carriers and SCD patients using the characteristic blood stain patterns produced by each sample on paper .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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