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seven
(redirected from heptad)

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.03 sec.
seven
symbolizes good luck in ancient and modern societies. [World Culture: Jobes, 1421–1422]

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The S2 subunit, which contains a putative fusion peptide and 2 heptad repeats (HR1 and HR2), is responsible for fusion between the viral and target cell membranes.
The 2- heptad repeats play an essential role in membrane fusion and are able to form trimeric coiled coils (13).
Some of these substitutions were located in potential functional domains, such as the fusion domain (codon 122) and the heptad repeat A (HRA) region (codons 135, 143, and 167).
 
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