FIG. 2.
(A) Heptad repeats found in the HBHA sequence with the highest coiled-coil propensity, as predicted by the program PCOILS (5). Numbers on the left are amino acid residues. (B) Probability of residues forming either two-stranded (solid line) or three-stranded (dashed line) coiled coils, as predicted by the program MULTICOIL (31).