Proline is one of the twenty amino acids that are used by living organisms as a building block of proteins. Technically, proline is an imino acid, as it contains no amino group.
In proteins, proline can act as a structural disruptor for α helices, and as a turning point in β sheets. Multiple prolines in a row can create a proline helix.
... (1861-1930), arctic explorer, scientist and international statesman
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Francisco de Orellana - first to navigate down the Amazon River
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William Parry[?], (born 1790), ...