However, certain factors do seem to increase the likelihood of a person developing the condition
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A few peptides are in early-stage clinical testing, and wider usage may be years away

Abbreviations AA Alopecia Areata NAC N -acetylcysteine System XC Cystineglutamate transporter exchange transport system EAAT3 Excitatory amino acid transporter 3 ASCT Alanineserinecysteine transporter GSH Glutathione Hcy Homocysteine CBS Cystathionine--synthase CSE Cystathionine--lyase GGT -Glutamyl transpeptidase ROS Reactive oxygen species MT Metallothionein Nrf2 Nuclear factor erythroid 2-related factor 2 PTEN Phosphate and tensin homolog deleted on chromosome 10 PTP Protein tyrosine phosphatase CoA Genome-wide association studies CoA Coenzyme A TCA Tricarboxylic acid TRP-1 Tyrosinase-related protein 1 TRP-2 Tyrosinase-related protein 2 GPX4 GSH peroxidase 4 mTORC1 Mechanistic target of rapamycin complex 1 Rag Recombination activating gene 4EBPs Eukaryotic initiation factor 4E-binding proteins -glucys Amino-acid transporter solute carrier family 7 member 11(SLC7A11) -glutamatecysteine INF- Interferon HHcy Hyperhomocysteinemia CRH Corticotropinreleasing hormone Author contributions Wen Xu, Xie Bo, Dongfan Wei and Xiuzu Song drafted the manuscript and prepared the figures

Catalase (CAT, EC 1.11.1.6) activity The activity of catalase (CAT) was determined following the disappearance of H 2 O 2 at 240 nm (15)
The limited volume that the nasal cavity can accommodate, approximately 100-200 microliters per nostril without runoff, means that higher concentrations deliver more peptide per spray