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July 2004 in “The journal of investigative dermatology/Journal of investigative dermatology” The enzymes Aldh1a2 and Aldh1a3 are involved in making retinoic acid in hair follicles and have different roles in hair growth.
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February 1998 in “Gene” The B2 genes are crucial for hair growth in rats.
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September 2021 in “EMBO Molecular Medicine” A new small peptide may help hair growth by activating a specific receptor and should be tested in humans.