The procapsid is sampled on spherical sections one pixel thick, and the B-capsid on similarly sampled icosahedral sections. Protein density is dark. Half-sections are shown. (A) At a radius of 564 Å, the sections pass above the triplexes. The asymmetry of the procapsid hexons contrasts with the 6-fold symmetry of the mature hexons. (B) At 536 Å radius, the triplexes present as triangular densities. (C) At 503 Å radius, the triplexes present as regular triplets of density. (D) At 470Å radius, the floor domains form regular, non-contacting, rings in the procapsid, and the contiguous floor in the mature capsid.