16000
An alanine scan of the angiotensin IV peptide revealed that replacement of the Val ( 1 ) , Ile ( 3 ) , His ( 4 ) , or Phe ( 6 ) residues with Ala attenuated peptide - induced improvements in novel object recognition , whereas Tyr ( 2 ) or Pro ( 5 ) replacement did not significantly affect performance .
 Chemical: alanine; Chemical: angiotensin IV; Chemical: Val; Chemical: Ile; Chemical: His; Chemical: Phe; Chemical: Ala; Chemical: Tyr; Chemical: Pro
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: alanine; Chemical: angiotensin IV; Chemical: Val; Chemical: Ile; Chemical: His; Chemical: Phe; Chemical: Ala; Chemical: Tyr; Chemical: Pro