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Nanostructured polyelectrolyte membranes ( PEMs ) , which are widely used as permselective diffusion barriers in fuel cell technologies and electrochemical processing , are considered as protective membranes suitable for blocking warfare toxins , including water - soluble nerve agents such as sarin .
 Chemical: sarin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: sarin