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May 2015 in “Tissue Engineering Part C-methods” A two-step method was created in 2015 to make more cells that help with hair growth, but they need to be combined with other cells for 4 days to actually form new hair.
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June 2015 in “Stem Cell Research & Therapy” Wnt and Notch signaling help wound healing by promoting cell growth and regulating cell differentiation.
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January 2020 in “Frontiers in Physiology” Good feather growth in poultry needs the right balance of proteins, amino acids, minerals, and vitamins.
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January 2018 in “Advances in Experimental Medicine and Biology” The document concludes that hair follicles have a complex environment and our understanding of it is growing, but there are limitations when applying animal study findings to humans.