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Dermal papillae cells, important for hair growth, come from multiple cell lines and can be formed by skin cells, regardless of their origin or hair cycle phase. These cells rarely divide, but their ability to shape tissue may contribute to their efficiency in inducing hair growth.

The research found a way to identify and study skin cells with stem cell traits, revealing they behave differently in culture and questioning current stemness assessment methods.

Trichohyalin is also found in the outer layers of normal human skin.

The new test can measure very small amounts of testosterone in hair, and grinding the hair up first gives more accurate results.

Feline cutaneous lymphocytosis is likely reactive, while canine cutaneous lymphocytosis needs more study to understand its nature.