69 citations
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May 2016 in “General and Comparative Endocrinology” External factors can significantly affect hair cortisol levels, so it's not always a reliable stress marker.
7 citations
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March 2011 in “The Journal of Gene Medicine” Lentiviral vector effectiveness in skin is influenced by external factors, not receptor availability.
1 citations
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January 1995 in “Lincoln University Research Archive (Lincoln University)” Wool growth is mainly controlled by external factors and specific proteins, not the follicles themselves.
12 citations
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March 1981 in “International Journal of Dermatology” External factors like certain shampoos, bacterial infections, and parasites might cause hair defects similar to genetic conditions.
1 citations
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December 2020 in “International journal of molecular sciences” External factors can cause skin cancer cells that usually don't spread to grow and form tumors in mice.