orthosteric site

https://doi.org/10.1351/goldbook.14173
Binding site recognized by the endogenous agonist of a receptor.
See also: allosteric site
Source:
PAC, 2011, 83, 1129. (Glossary of terms used in biomolecular screening (IUPAC Recommendations 2011)) on page 1150 [Terms] [Paper]