Examlex
Which of the following is not considered one of the three layers of the integumentary system?
Leucine
An essential amino acid used by the body in protein synthesis and various metabolic processes.
Glutamic Acid
An amino acid that is critical for proper brain function and metabolism, and serves as a neurotransmitter.
Lysine
An essential amino acid required for growth and tissue repair, crucial in the production of various enzymes and hormones.
Keratin
A type of structural protein found in hair, nails, and the outer layer of skin, providing toughness and water-resistance.
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