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From Biolecture.org
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<p><strong>In my opinion, the number of possilble kinds of protein is 20^300(The number of type of amino acid is 20, and the average length of protein is 300aa ->20*20*20*......*20 ) -> protein space</strong></p>
<p>[[File:Possible type of proteins.png]]</p>
<p> </p>
