7962
The three - step approach of CliEn - seq involves in vivo synthesis of S - adenosyl - L - methionine ( SAM ) analogues from cell - permeable methionine analogues by engineered SAM synthetase ( methionine adenosyltransferase or MAT ) , in situ chromatin modification by engineered PMTs , subsequent enrichment and sequencing of the uniquely modified chromatins .
 Chemical: S - adenosyl - L - methionine; Chemical: SAM; Chemical: methionine; Chemical: SAM; Chemical: methionine
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 - adenosyl - L - methionine; Chemical: SAM; Chemical: methionine; Chemical: SAM; Chemical: methionine