May 01, 2016 · 1. Introduction. Hyaluronic acid (HA) is a linear polysaccharide composed of dimeric units of N-acetyl glucosamine and glucuronic acid. This polymer is a constituent of tissues such as skin, cartilage, umbilical cord, bird crests, synovial fluid, vitreous humour and it is also present in the cell walls of bacteria like Streptococcus zooepidemicus (Shiedlin et al., 2004).
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