17224
Allosteric binding sites are topographically distinct from the endogenous ligand ( orthosteric ) binding site , allowing for co - occupation of a single receptor with the endogenous ligand and an allosteric modulator .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None