15175
IM - MS distributions of the analogue peptides , when compared to the distribution for BK , indicate the multiple structures are associated with different combinations of cis and trans forms of the three proline residues .
 Chemical: proline
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: proline