4496
Additionally , the S - adenosylmethionine / S - adenosylhomocysteine ratio , an index of transmethylation potential , in TAMR - MCF - 7 cells increased to ~ 3 . 6 - fold relative to that in MCF - 7 cells , a finding that may result from upregulation of methionine adenosyltransferase IIa and S - adenosylhomocysteine hydrolase .
 Chemical: S - adenosylmethionine; Chemical: S - adenosylhomocysteine; Chemical: methionine; Chemical: S - adenosylhomocysteine
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: S - adenosylmethionine; Chemical: S - adenosylhomocysteine; Chemical: methionine; Chemical: S - adenosylhomocysteine