6457
Medaka has two ligands , BNP and C - type NP3 ( CNP3 ) ( but not ANP ) , that have greater affinity for the two O . latipes GC - A receptors ( OLGC ) , OLGC7 and OLGC2 , respectively .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None