One of the gating factors in studying the human brain is having the ability to conduct research on actual functioning human brain tissue. As a result, many scientific studies are conducted on rodents as a mammalian proxy. The drawback to this approach is that rodent brains are different in structure and function. According to Johns Hopkins, structurally, the human brain is approximately 30 percent neurons and 70 percent glia, while the mouse brain has the opposite ratio [1].
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