Fig. 4.

Stereoviews of the β-hexamer shown as ribbon drawings that correspond to residues 27–35 of the B (red) and C (green) subunit amino termini. (a) The β-hexamer viewed directly down the quasi six-fold axis towards the particle interior. The amino and carboxyl termini are labeled for two of the six polypeptide renditions. Note that the strands labeled are not related by icosahedral symmetry. (b) The β-hexamer viewed approximately tangential to the virus surface. Residue numbers are given for the same polypeptides labeled above.