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Among these products , some like short - chain fatty acids and organic acids are energy substrates for the colonic mucosa and several peripheral tissues while others like sulfide and ammonia can affect the energy metabolism of colonic epithelial cells .
 Chemical: fatty acids; Chemical: sulfide; 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: fatty acids; Chemical: sulfide; Chemical: ammonia