The three main layers of the hair shaft.
Cortex
Cuticle
Medulla
Apex
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Scale Overlap
Defense
Attached
Health
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Protein
Medulla
Cortex
Cuticle
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Elasticity
Natural color
Unique protein
All of the above
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Cuticle
Cortex
Medulla
Alkaline
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Medulla
Protein
Chemicals
All Of the Above.
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