L. Hong and J. D. Simon, “Current Understanding of the Binding Sites, Capacity, Affinity, and Biological Significance of Metals in Melanin” The Journal of Physical Chemistry B, Vol. 111, No. 8, 2008, pp. 7938-7947. http://dx.doi.org/10.1021/jp071439h
 W. Korytowski, P. Hintz, R. C. Sealy and B. Kalyanaraman, “Mechanism of Dismutation of Superoxide Produced during Autoxidation of Melanin Pigments,” Biochemical and Biophysical Research Communications, Vol. 131, No. 2, 1985, pp. 659-665. http://dx.doi.org/10.1016/0006-291X(85) 91288-4
 W. Korytowski, B. Pilas, T. Sarna and B. Kalyanaraman, “Photoinduced Generation of Hydrogen Peroxide and Hydroxyl Radicals in Melanins,” Photochemistry and Photobiology, Vol. 45, No. 2, 1987, pp. 185-190. http://dx.doi.org/10.1111/j.1751-1097.1987.tb05362.x
 J. M. Menter, D. Eatman, M. Bayorh, A. M. Dawaghreh and I. Willis, “Pigment Melanin Scavenges Nitric Oxide in Vitro: Possible Relevance to Keloid Formation,” Research Letters in Physical Chemistry, Vol. 2008, 2008, Article ID: 210616. http://dx.doi.org/10.1155/2008/210616
 M. R. Chedekel, “Photophysics and Photochemistry of Melanin,” In: L. Zeise, M. R. Chedekel and T. B. Fitzpatrick, Eds., Melanin: Its Role in Human Photoprotection, Valdenmar, Overland Park, 1994, pp. 11-22.
 J. M. Menter and I. Willis, “Electron Transfer and Photoprotective Properties on Melanins in Solution,” Pigment Cell Research, Vol. 10, No. 4, 1997, pp. 214-217. http://dx.doi.org/10.1111/j.1600-0749. 1997.tb00487.x
 J. M. C. Gutteridge, I.-Z. Nagy, L. Maidt and R. A. Floyd, “ADP-Iron as a Fenton Reagent: Radical Reactions Detected by Spin-Trapping, Hydrogen Abstraction, and Aromatic Hydroxylation,” Archives of Biochemistry and Biophysics, Vol. 277 No. 2, 1990, pp. 422-428. http://dx.doi.org/10.1016/0003-9861(90)90599-T
 B. Roznowki, J. M. Burke, M. E. Boulton, T. Sarna and M. Roznowka, “Human RPE Melanosomes Protect from Photosensitized and Iron-Mediated Oxidation but Become Pro-Oxidant in the Presence of Iron upon Photodegradation,” Investigative Ophthalmology and Visual Science, Vol. 49, No. 7, 2008, pp. 2838-2847. http://dx.doi.org/10.1167/iovs.08-1700
 L. Louw, “The Keloid Phenomenon: Progress toward a Solution,” Clinical Anatomy, Vol. 20, No. 1, 2007, pp. 3-14. http://dx.doi.org/10.1002/ca.20374
 P. D. Butler, M. T. Longaker and G. P. Yang, “Current Progress in Keloid Research and Treatment,” Journal of the American College of Surgeons, Vol. 206, No. 4, 2008, pp. 731-741. http://dx.doi.org/ 10.1016/j.jamcollsurg.2007.12.001
 M. C. Naylor and A. E. Brissett, “Current Concepts in Etiology and Treatment of Keloids,” Facial Plastic Surgery, Vol. 28, No. 5, 2012, pp. 504-512. http://dx.doi.org/10.1055/s-0032-1325644
 A. S. Halim, A. Emami, I. Salahshourifar and T. Ponnuraj, “Keloid Scarring: Understanding the Genetic Basis, Advances,” Archives of Plastic Surgery, Vol. 39, No. 3, 2012, pp. 184-189. http://dx.doi.org/ 10.5999/aps.2012.39.3.184
 S. B. Russell, J. D. Russell, K. M. Trupin, A. E. Gayden, S. R. Latha Raju and S. M. Williams, “Epigenetically Altered Wound Healing in Keloid Fibroblasts,” Journal of Investigative Dermatology, Vol. 130, No. 10, 2012, pp. 2489-2496. http://dx.doi.org/10.1038/jid.2010.162
 Y. W. Wirohadidjojo, S. Radiono, A. Budiyanto and H. Soebono, “Cellular Viability, Collagen Deposition and Transforming Growth Factor β1 Production among Ultraviolet B-Irradiated Keloids Fibroblasts,” Aesthetic Plastic Surgery, Vol. 35, No. 6, 2011, pp. 1050-1055. http://dx.doi.org/10.1007/s00266-011-9732-x
 Y.-C. Hsu, M. Hsiao, Y. W. Chien and W.-R. Lee, “Exogenous Nitric Oxide Stimulated Collagen Type I Expression in Keloid Fibroblasts by a cGMP-Dependent Manner,” Nitric Oxide, Vol. 16, No. 2, 2006, pp. 258-265.
 Y.-C. Hsu, M. Hsaio, L.-F. Wang, Y.-W. Chien and W.-R. Lee, “Nitric Oxide Produced by iNOS Is Associated with Collagen Synthesis and Keloid Scar Formation,” Nitric Oxide, Vol. 14, No. 4, 2006, pp. 327-334. http://dx.doi.org/10.1016/j.niox.2006.01.006
 P. R. Crippa, “Oxygen Adsorption and Photoreduction on Fractal Melanin Particles,” Colloids and Surfaces B, Vol. 20, No. 4, 2001, pp. 315-319. http://dx.doi.org/10.1016/S0927-7765(00)00206-X
 H. Kojima, N. Nakatsubo, K. Kichuchi, S. Kawahara, Y. Kirino, H. Nagoshi, Y. Hirata and T. Nagano, “Detection and Imaging of Nitric Oxide with Novel Fluorescent Indicators: Diaminofluoresceins,” Analytical Chemistry, Vol. 70, No. 13, 1998, pp. 2446-2453. http://dx.doi.org/10.1021/ac9801723
 J. P. Crow, “Dichlorodihydrofluorescein and Dihydrorhodamine 123 Are Sensitive Indicators of Peroxynitrite in Vitro: Implications for Intracellular Measurement of Reactive Nitrogen and Oxygen Species,” Nitric Oxide: Biology and Chemistry, Vol. 1, No. 2, 1997, pp. 145-157. http://dx.doi.org/ 10.1006/niox.1996.0113
 A. R. Kim, Y. Zou, H. S. Kim, J. S. Choi, G. Y. Chang, Y. J. Kim and H. Y. Chung, “Selective Peroxynitrite Scavenging Activity of 3-Methyl-1,2-cyclopentanedione from Coffee Extract,” Journal of Pharmacy and Pharmacology, Vol. 54, No. 10, 2002, pp. 1385-1392. http://dx.doi.org/10.1211/0022357027 60345473
 T. Nauser and W. H. Koppenol, “The Rate Constant of the Reaction of Superoxide With Nitrogen Monoxide: Approaching the Diffusion Limit,” The Journal of Physical Chemistry A, Vol. 106, No. 16, 2002, pp. 4084-4086. http://dx.doi.org/10.1021/jp025518z
 S. A. Cotton, A. L. Herrick, M. I. V. Jayson and A. J. Freemont, “Endothelial Expression of Nitric Oxide Synthases and Nitrotyrosine in Systemic Sclerosis Skin,” The Journal of Pathology, Vol. 189, 1999, pp. 273-278.
 A. Dooley, B. Gao, S.-W. Xu, D. J. Abraham, C. M. Black, M. Jacobs and K. R. Bruckdorfer, “Effect of Nitric Oxide and Peroxynitrite on Type I Collagen Synthesis in Normal and Scleroderma Dermal Fibroblasts,” Free Radical Biology and Medicine, Vol. 43, No. 2, 2007, pp. 253-264. http://dx.doi.org/ 10.1016/j.freeradbiomed.2007.04.017
 A. Dooley, B. Gao, N. Bradley, D. J. Abraham, C. M. Black, M. Jacobs and K. R. Bruckdorfer, “Abnormal Nitric Oxide Metabolism in Systemic Sclerosis: Increased Levels of Nitrated Proteins and Asymmetric Dimethylarginine,” Rheumatology, Vol. 45, No. 6, 2006, pp. 676-684. http://dx.doi.org/10.1093/ rheumatology/kei276