A group or unit of seven things, people, or elements, often used in chemistry, music, or religious contexts.
From Greek 'hepta' meaning seven, with the suffix '-ad' meaning a group or series of items. The term emerged in medieval and scientific writing to describe sets of seven.
In protein chemistry, a heptad repeat is a seven-amino-acid pattern that creates the famous coiled-coil structure in proteins—this is how many powerful biological molecules are built!
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