May 1961 in “Tumori Journal” This study found that vitamin A treatment in rats reduced hyperplastic-dysplastic changes and sebaceous gland hypertrophy associated with 3,4-benzpyrene-induced tumors.
6 citations
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January 2018 in “Advances in experimental medicine and biology” 
34 citations
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August 1966 in “Experimental cell research” This study examined developing hair cortex with electron microscopy and found that keratin fibrils form between specific regions in hair follicles and aggregate into twisted cables.
October 2022 in “Regenerative Biomaterials” This study demonstrated that fibrin hydrogels support skin-derived precursors in hair follicle neogenesis in mice, with new hair growth and regeneration of blood vessels and sebaceous glands observed.
24 citations
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June 2003 in “Journal of Structural Biology” This study suggests that varying intersheet interactions may explain the differences between the two polymorphic forms of macrofibril assembly in Merino wool and hair.