(n.) A nitrogenous phosphorized principle found in brain tissue. By decomposition it yields neurine, fatty acids, and other bodies.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). protagon. Retrieved September 23, 2026, from http://smartdefine.org/protagon/definitions/2050147 |
| Chicago | Webster's. 2011. "protagon" http://smartdefine.org/protagon/definitions/2050147 (accessed September 23, 2026). |
| Harvard | Webster's 2011, protagon, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/protagon/definitions/2050147>. |
| MLA | Webster's. "protagon" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/protagon/definitions/2050147> |