How many different kinds of protons are present in the following molecule? 
Definitions:
Stapes
The smallest bone in the human body, located in the middle ear, playing a critical role in the conduction of sound vibrations to the inner ear.
Oval Window
A membrane-covered opening that leads from the middle ear to the inner ear, playing a key role in the mechanics of hearing.
Vomeronasal Organ
Pheromone-detecting organ of vertebrates.
Pheromones
Pheromones are chemical substances produced and released into the environment by an animal, affecting the behavior or physiology of others of its species.
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