According to the gate control theory of pain, the structure that is the likely location of the gate is the substantia gelatinous.
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What is substantia gelatinous?</h3>
- A group of cells called the substance gelatinosa can be found in the spinal cord's gray matter (dorsal horns). 
- It receives direct input from the dorsal (sensory) nerve roots, particularly those fibers from pain and thermoreceptors, and is present at all levels of the cord.
- The spinal cord has a system that permits pain signals to be amplified in the brain before being processed at the spinal cord itself, or attenuated there, in accordance with the Gate Control Theory of Pain.
- The "gate" is the device that either permits or forbids the transmission of pain signals.
- To feel intense pain if the gates are more open since many more pain signals will flow through to the brain. 
- The likelihood that you will feel less discomfort increases as the gates are more tightly shut.
Learn more about spinal cord here:
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Epigenesis
Epigenesis is the concept that emphasizes development resulting from ongoing bidirectional exchanges between heredity and all levels of the environment.  
Epigenesis is the development of organisms such as plants, animals and fungi from an egg, seed, or spore or egg through a series of phases in which unorganized cells differentiate into organs and organs systems. The theory of epigenesis which claimed that structures evolve during development that are not already preformed was created by the German physician C. F. Wolff in 1759.
 
        
             
        
        
        
Warfare jet engine and space exploration 
        
             
        
        
        
The system of scientific naming or nomenclature is use to identify an organisms worldwide. The system of naming of an organism is introduced by Carolus Linnaeus. The scientific name of any organism is written by its genus name and species name. This is called binomial system of naming. While writing the scientific name of an organism, the name of the genus written first with a capital letter and the name of the species is written second with a small letter.  When typed scientific name is in italics and when it is hand written the genus name and the species are to be underlined separately.  
In the given example, the scientific name of orange-barred sulfur butterfly is <em>Phoebis philea</em>. <em>Phoebis</em> is its genus name and <em>philea</em> is the species name.