38 citations
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August 2012 in “Biochemical and biophysical research communications” Human leukocytes and beard hair follicle cells have internal daily clocks, and PER1 and PER3 genes may indicate individual circadian rhythms.
12 citations
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January 2019 in “Sleep medicine” Night shift work disrupts the body's natural clock genes.
41 citations
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June 2006 in “Journal of Investigative Dermatology” Beard and scalp hair cells have different gene expressions, which may affect beard growth characteristics.
March 2010 in “Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature” Beard hair medulla cells have a unique and varied keratin pattern.
65 citations
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May 2006 in “Journal of Investigative Dermatology” Dexamethasone may influence hair growth by altering estrogen receptor activity in hair cells.