15997
The present investigation assessed and characterized : ( 1 ) dose - dependency of angiotensin IV ' s cognitive enhancement in a C57BL / 6J mouse model of novel object recognition , ( 2 ) the time - course for these effects , ( 3 ) the identity of residues in the hexapeptide important to these effects and ( 4 ) the necessity of actions at angiotensin IV receptors for procognitive activity .
 Chemical: angiotensin IV; Chemical: hexapeptide; Chemical: angiotensin IV
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: angiotensin IV; Chemical: hexapeptide; Chemical: angiotensin IV