It was first identified in human plasma in 1973 by biochemist Loren Pickart, who noticed that older liver tissue exposed to a protein fraction from young blood began behaving like young tissue
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Concentrations in shampoo formulations generally range from 0.01% to 0.1%, lower than leave-on products but still sufficient to stimulate follicular activity when used consistently as part of a daily hair care routine
This theory is supported by evidence such as autosomal dominant familial AD with mutations in presenilins 1, 2 (PSEN1/PSEN2) and amyloid precursor protein (APP) genes, which increase the levels of the A42 load in the brain with high penetrance (Bateman et al., 2010