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This study concluded that hair pigmentation, as measured by eumelanin-to-pheomelanin ratio, is not a risk factor for developing alopecia areata when compared to androgenetic alopecia patients.

This study found that quercetin increased melanin production in hair follicle tissues from C3H/HeN Jel mice, correlating with higher levels of tyrosinase protein and TRP-2 protein expression.

In this study, silencing P-cadherin in human scalp hair follicles reduced melanogenesis and associated protein expression, suggesting P-cadherin is crucial for normal hair pigmentation via GSK3β-mediated Wnt signaling.

In this study, researchers conducted a whole-transcriptome analysis of Dazu Black Goats and Inner Mongolia Cashmere Goats to explore differences in hair follicle development and melanin production, revealing variations in hair characteristics and 640 differentially expressed RNAs that could inform goat breeding and textile applications.

In this study, α-MSH and cyclic AMP were found to stimulate melanogenesis in hair follicle cultures, while cyclic GMP and melatonin inhibited melanin production but not tyrosinase activity.