29938
Methionine aminopeptidases ( MetAPs ) , which remove the initiator methionine from nascent peptides , are essential in all organisms .
 Chemical: Methionine; 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: Methionine; Chemical: methionine