What is the starting material in the following reaction? 
Definitions:
X Chromosome
One of the two sex chromosomes, X and Y, with the X chromosome carrying genes essential for the development of female physical characteristics and playing a role in male development as well.
Brain Development
The process by which the nervous system, including the brain, grows, matures, and learns, starting from before birth and continuing into adulthood.
Heritability
A statistical measure that indicates how much of the variation in a given trait within a population can be attributed to genetic differences among individuals.
Genetic Influences
Genetic influences refer to the impact that the genetic makeup of an individual has on their physical traits, behavior, and susceptibility to certain conditions or diseases.
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