18729
The loop was embedded between two helices that assemble into a coiled - coil , which served as a receptor - mimetic folding constraint ( LPA ( 1 ) - CC - EL2 peptide ) .
 LPA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 LPA