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1,2,3 It can also be due to inherited cobalamin malabsorption and disorders of the gastrointestinal microbiome

For hair growth, the relevant signaling pathways are: vascular stimulation (more blood flow to the dermal papilla), follicle repair (extending the anagen growth phase), inflammation modulation (calming the chronic low-grade inflammation that contributes to follicular miniaturization), and systemic growth signaling (IGF-1 levels that influence overall regenerative capacity)

Proteomic analysis of the secretome of serum-deprived HUVECs isolated from healthy female and male newborns revealed higher expression of proteins involved in cellular response to stress (e.g., several members of Annexin and Heat Shock Protein families) and apoptosis (e.g., PTX3) in male cells (120)

Differential activation of insulin receptor substrates 1 and 2 by insulin-like growth factor-activated insulin receptors