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Wash your hair with tepid water. Don´t wash your hair with warm or hot water. Heat activates TGF-beta. TGF-beta negatively regulates hair growth.

http://www.ncbi.nlm.nih.gov/pubmed/20599762

Quote:

?Transforming growth factor-beta 1 (TGF-beta1) is secreted as a latent complex, which consists of latency-associated peptide (LAP) and the mature ligand. The release of the mature ligand from LAP usually occurs through conformational change of the latent complex and is therefore considered to be the first step in the activation of the TGF-beta signaling pathway. So far, factors such as heat, pH changes, and proteolytic cleavage are reportedly involved in this activation process, but the precise molecular mechanism is still far from clear.”

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