heptad

Adjective modifier

• canonical: Thus, they help explain why in natural sequences, inserts after canonical heptad repeats most commonly of four-residues.

Modifies a noun

• motif: A new class of receptor for herpes simplex virus has heptad repeat motifs that are common to membrane fusion proteins.
• register: SOCKET unambiguously defines coiled-coil helix boundaries, oligomerisation states and helix orientations, and also assigns heptad registers.