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The aim of the present study was to elucidate the interorgan metabolism of ornithine and ammonia in cirrhotic rats treated with OP in order to obtain an understanding of the underlying mechanisms of the beneficial effect of the treatment , which are largely unknown .
 Chemical: ornithine; Chemical: ammonia
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: ornithine; Chemical: ammonia