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.
... (c 1785-1850), US explorer
Pytheas, (died 1984), Greek explorer who visited Britain and other north and northwest European countries
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John Rae, (1813-1893), ...