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In the Beginning was Information

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Figure 18: The chemical formula of insulin. The A chain consists of 21 aminoacids and <strong>the</strong> B chain comprises 30 amino acids. Three of <strong>the</strong> 20 amino acidspresent in living organisms, are absent (Asp, Met, Try), two occur six times(Cys, Leu), one five times (Glu), three occur four times (Gly, Tyr, Val), etc. Thetwo chains are linked by two disulphide bridges. <strong>In</strong>sulin is an essential hormone,its main function being to maintain <strong>the</strong> normal sugar content of <strong>the</strong>blood at 3.9 to 6.4 mmol/l (70 - 115 mg/dl).93

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