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Bacterial hyaluronic acid (HA) is a natural non-sulfated high molecular weight glycosaminoglycan that may be used to study formulations of non-animal gels potentially useful for procedures such as soft tissue augmentation.
Barry Halliwell. Superoxide-dependent formation of hydroxyl radicals in the presence of iron salts: Its role in degradation of hyaluronic acid by a superoxide-generating system. FEBS Lett. 1978, 96 (2),238-242 .