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2. Hyaluronic acid - Wikipedia

   en.wikipedia.org/wiki/Hyaluronic_acid

   Hyaluronic acid (/ ˌ h aɪ. ə l j ʊəˈr ɒ n ɪ k /; [1] [2] abbreviated HA; conjugate base hyaluronate), also called hyaluronan, is an anionic, nonsulfated glycosaminoglycan distributed widely throughout connective, epithelial, and neural tissues.

3. Hemagglutinin (influenza) - Wikipedia

   en.wikipedia.org/wiki/Hemagglutinin_(influenza)

   Influenza hemagglutinin (HA) or haemagglutinin [p] (British English) is a homotrimeric glycoprotein found on the surface of influenza viruses and is integral to its infectivity. Hemagglutinin is a class I fusion protein , [ 1 ] [ 2 ] having multifunctional activity as both an attachment factor and membrane fusion protein .

4. Hydroxyapatite - Wikipedia

   en.wikipedia.org/wiki/Hydroxyapatite

   Hydroxyapatite (IMA name: hydroxylapatite [5]) (Hap, HAp, or HA) is a naturally occurring mineral form of calcium apatite with the formula Ca 5 (PO 4) 3 (OH), often written Ca 10 (PO 4) 6 (OH) 2 to denote that the crystal unit cell comprises two entities. [6] It is the hydroxyl endmember of the complex apatite group.

5. Sodium hyaluronate - Wikipedia

   en.wikipedia.org/wiki/Sodium_hyaluronate

   It is injected into the joint capsule, to act as both a shock absorber and a lubricant for the joint. [ 3 ] [ 4 ] [ 5 ] Thus sodium hyaluronate is used as a viscosupplement, administered through a series of injections into the knee , increasing the viscosity of the synovial fluid , which helps lubricate, cushion and reduce pain in the joint. [ 6 ]

6. Glycosaminoglycan - Wikipedia

   en.wikipedia.org/wiki/Glycosaminoglycan

   The fourth class of GAG, hyaluronic acid (HA), is not sulfated and is synthesized by three transmembrane synthase proteins HAS1, HAS2, and HAS3. HA, a linear polysaccharide, is composed of repeating disaccharide units of →4)GlcAβ(1→3)GlcNAcβ(1→ and has a very high molecular mass, ranging from 10 5 to 10 7 Da. Each HAS enzyme is capable ...

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