10657
In order to gain deeper insight into the role of the amino - terminal domain of the p24 ( CA ) protein during viral replication , eight highly conserved proline residues known to promote turns and to terminate alpha - helices within the p24 tertiary structure were replaced by a leucine residue ( P - position - L ) .
 p24, CA, p24
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 p24, CA, p24