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Season 198 - Day 2 of 14


This protein filament grows from follicles found in the dermis and is a defining characteristic of mammals.
It plays a significant role in thermal regulation, protection, and sensory functions.
This feature can be straight, wavy, or curly and is often styled in various ways.
It's composed mainly of keratin and in humans, it is an important aspect of personal appearance and cultural identity.
What is this common feature?


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