17529
However , natural RBC - based products suffer from limited shelf life due to pathological contamination and also present risks of refractoriness , graft - versus - host disease , immunosuppression , and acute lung injury .
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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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