7669
We aim to " tilt " the stability of the H1 loop structure from a noncanonical conformation to a ( humanized ) type 1 canonical conformation by studying the effect of selected mutations to the amino acid sequence of the H1 , H2 , and proximal residues .
 Chemical: amino acid
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: amino acid