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One barrier to entry into a monopoly market is:
Hormones
Chemical substances produced in the body that regulate and control the activity of certain cells or organs.
Lesion
Tissue destruction. A brain lesion is a naturally or experimentally caused destruction of brain tissue.
Defective Cells
Cells that have abnormalities or dysfunctions, often leading to diseases or health conditions.
Brain
The central organ of the human nervous system, responsible for processing sensory information, and directing responses.
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