7816
Hepatic methionine was markedly decreased in db / db mice , although the hepatic activity of betaine homocysteine methyltransferase was increased .
 Chemical: methionine; Chemical: homocysteine
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: methionine; Chemical: homocysteine