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This study found that poly(adenosine diphosphate-ribose) synthesis in human skin varies by cell type and condition, with distinct patterns in psoriatic, cancerous, and normal tissues.

In this study, researchers localized arginine and citrulline in rat hair follicles and found that arginine is abundant in trichohyalin droplets, while citrulline predominantly accumulates in the hardened inner sheath and medulla.

This study suggests that increased activity of the histamine synthesizing enzyme histidine decarboxylase may play a role in initiating the anagen phase of hair regrowth in mice.

This study found that exposure to sex steroid biosynthesis inhibitors increases the expression of piRNA pathway genes in frog larvae, suggesting these genes play a role in gonadal sex differentiation.

This review discusses recent advances in polydopamine-based biomaterials and their growing potential in personalized medicine, but reports no new experimental results; the authors highlight both opportunities and challenges for future applications.

This study found that intermediate filaments and matrix proteins in presumptive hair shaft cells are synthesized sequentially, identifying a new polypeptide component that changes during hair cell differentiation.

This review discusses the role of norepinephrine release and protein kinase C activation in the development of benign prostatic hypertrophy, suggesting potential targets for new therapies, but it reports no new clinical results.

This case report details a 4-year-old girl with arginosuccinic-aciduria, showing neurological symptoms and weakened hair, but the mechanisms behind these issues remain uncertain.

This study observed that a low-protein, arginine-supplemented diet improved the abnormal hair appearance in untreated patients with argininosuccinic aciduria.

This study found that cysteine and arginine are crucial for hair growth in hair follicles, with cysteine affecting hair fibre diameter and arginine involved in protein incorporation and energy metabolism.

This study found that nitrate, rather than ammonium, significantly enhances phosphate starvation responses in plants through a regulatory cascade involving NIGT1, SPX, and PHR1 proteins.

This study found that L-cystine, D-pantothenat, and miliacin can enhance the metabolic capacity and proliferation of human keratinocytes, with a combination of these additives potentially providing synergistic benefits in growth media.

This study found that the AtSfh1 protein in Arabidopsis is essential for phosphatidylinositol-4,5-bisphosphate signaling crucial to polarized root hair growth, utilizing both phosphatidylinositol and phosphatidylcholine-binding activities.

Metabolic disorders can cause hair structure defects and growth issues, but amino acid levels in hair remain normal.

This review discusses the pathways of androgen biosynthesis and reports no new findings, highlighting the need to understand the interplay between the classic and backdoor pathways.

This study examined the effects of finasteride on human Leydig cells and found altered methylation in dopaminergic pathways, suggesting potential epigenetic contributions to post-finasteride syndrome, warranting further investigation.

This study found that human peptidylarginine deiminase type III is the predominant isoform in hair follicles and may modulate structural proteins during hair and hair follicle formation.

In this study, researchers identified specific Se6OMT enzymes in *S. epigaea* involved in the cepharanthine biosynthetic pathway, providing insights into their substrate promiscuity and essential genetic components for metabolic engineering and synthetic biology applications of cepharanthine production.

This study found that adding methionine to a low-protein diet improved wool production and feed efficiency in Angora rabbits by promoting hair follicle development through mechanisms involving IGF1, KAP, and versican signaling.

This study successfully developed a synthetic route for finasteride that achieves a 30.6% yield and is suitable for industrial production, avoiding the use of expensive or poisonous reagents.

This study found that activating the hexosamine pathway increased hyaluronic acid secretion and hair follicle stem cell numbers in vitro, suggesting its role in modulating skin homeostasis.

This study identified the genes for pyochelin siderophore biosynthesis as a novel target regulated by the heme-responsive PrrH sRNA in Pseudomonas aeruginosa.

This article discusses how activating the hexosamine pathway may enhance skin homeostasis by increasing hyaluronic acid secretion and supporting hair follicle stem cell self-renewal, but reports no new results.

This study found that neprilysin (NEP) activity and expression play a significant role in regulating the hair cycle in rats, with a specific inhibitor suppressing hair growth in mice.

Hair amino acid levels can indicate metabolic disorders.

This study found that Arabidopsis mutants with disrupted auxin conversion pathways displayed low auxin phenotypes and increased biosynthetic gene expression, suggesting a feedback mechanism maintains auxin homeostasis.

This study found that in Liaoning cashmere goats, overexpression of the PIP5K1A gene enhances skin fibroblast proliferation, while interference with this gene reverses melatonin-induced proliferation, and PIP5K1A regulates certain miRNA expressions, suggesting a role in improving cashmere yield and quality.

In this study, researchers identified two novel peptidylarginine deiminases from treated rat keratinocytes, both showing enzyme activity with PAD‐R11 reflecting a characteristic of epidermal enzymes.

This study found that plucking hair from rats' dorsal skin rapidly decreased ornithine decarboxylase activity, possibly due to an inhibitory substance that was activated by ammonium sulfate treatment.