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In this study, researchers developed a novel bio-patch from decellularized freeze-dried tumor tissues and hair melanin nanoparticles, which demonstrated enhanced wound healing in vivo by reducing oxidative stress, suppressing inflammation, and promoting angiogenesis.

This study found that splenic melanosis in C57BL/6 mice is associated with synchronized skin melanization during hair cycles, but decreases with age.

This study on rats found that topical application of bacterial melanin significantly stimulates hair growth by prolonging the anagen phase and enhancing vasodilation in the treated skin areas compared to controls, suggesting its potential as a cost-effective hair growth treatment.

This study found that both Japanese male and female hair darkens with age, with significant sex differences in melanin composition and melanosome morphology influencing hair color.

This abstract describes the role of melanin in determining hair color and protecting against UV radiation, highlighting how its production affects hair health, growth, and vitality, with reduced production contributing to greying with age.

This study found that melanin extracted from cuttlefish ink provided significant protection against UV radiation damage to human hair, suggesting its potential as a photoprotective agent in hair-care products.

This study identified a small population of PAX3+/CD34+ cells in human foreskin tissue that may serve as transition cells between melanocyte stem cells and hair follicle stem cells, characterized by specific marker expressions.

This study reported that discarded squid ink was used to develop a high-performance, environmentally friendly hair dye that offers a stable deep black color, UV protection, and preserves hair structure, while showing excellent biosafety in lab tests.

In this study, researchers developed non-invasive methods to monitor hair shaft, melanin, and collagen dynamics in C57BL/6 mice across different hair follicle cycle phases, supporting non-invasive research in hair loss treatment development.

In this study, adrenalectomy in rats on a diet lacking certain vitamin B components reversed fur graying and enhanced hair growth.

This study observed unexpected heterogeneity among pigment cells in human scalp hair follicles, identifying immature melanocyte populations outside traditional pigment production zones, raising questions about their potential roles beyond melanin synthesis.

This study used melamine formaldehyde particles to measure a pH gradient along the hair shaft, showing a significant pH decrease from the hair sheath to the external shaft.

This article discusses mouse genetic studies to explore factors influencing melanogenesis, highlighting pH and cysteine's roles, and proposes a hypothesis for human hair color diversity; it reports no new results.

This article discusses the roles of different proteins in melanogenesis and proposes a hypothesis to explain the diversity of human hair pigmentation, but it reports no new experimental results.

This study reports the development of a natural hair-coloring system using size-controlled ink particles from cuttlefish ink combined with chitosan, achieving darker and more uniform black coloration on hair than existing plant-based natural colorants, without the need for metallic mordants.

In this study, researchers explored the heterogeneity of pigment cells in the human scalp anagen hair follicle bulb and discovered unexpected subpopulations of melanocytes, including immature SOX10-negative cells, highlighting potential non-melanogenic roles or transitional migratory functions that require further investigation.

This study found that early pigment cell markers Sox10 and c-KIT, as well as DCT/TRP-2, were detectable in melanogenically-active melanocytes of the anagen bulb in human hair follicles.

This study developed a mouse model to mimic PHGDH gene copy number gain, finding that increased PHGDH expression leads to abnormal melanin production, which may offer insights into its role in melanoma.

In this study, researchers used Raman spectroscopy to identify melanin-specific features in mouse hair as potential biomarkers for gamma-radiation exposure, achieving a sensitivity of 88% and specificity of 83%, with classification accuracy declining over time beyond 7 days post-irradiation.

This review examines the histochemistry and keratinization processes of human hair, exploring the structural roles of keratin proteins, protein chains, and lipids, but offers no new results.

In this study, different types of catagen in the C57BL/6 mouse model exhibited varying effects on hair follicle melanocytes and melanin distribution, with spontaneous and dexamethasone-induced catagen showing pigment incontinence, while cyclophosphamide-induced catagen retained dendritic melanocytes but increased ectopic melanin.

This study found that spleens of black C57BL/6 mice contain eumelanin, with properties different from skin and hair melanin, and may originate from skin melanin transported by immune cells.

In this study, researchers observed that cosmetic peroxide bleaching causes oxidative damage and protein loss in human hair, not only affecting the cuticle but also deeper cortical structures, correlating with bleaching severity.

This review discusses the mechanisms of laser and IPL hair removal, particularly for darker skin types, and reports no new findings, highlighting potential adverse effects like pigmentation changes or scarring with improper use.