20467
Based on the inhibitor studies a series of new fluorogenic substrates containing a d - arginine residue in P3 position was synthesized , some of them were efficiently cleaved by TMPRSS2 .
 Chemical: d - arginine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: d - arginine