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Hi guys, I know that Protein structure related to their function. Certain protein usually have alpha helix is more prominent but certain protein have beta structure more prominent. My question is which aminoacid is favourable to form alpha helix and beta structure? What function unique to alpha helix and beta structure?

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http://www.biotecharticles.com/Biology-A...s-419.html
http://www.biotecharticles.com/Others-Ar...s-453.html

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http://www.biomedcentral.com/1472-6807/12/18