The Structure of Viruses [chapter]

JAMES H. STRAUSS, ELLEN G. STRAUSS
2008 Viruses and Human Disease  
a Two mirror image structures can be formed using T = 13 or T = 7, a symmetry referred to as "d" or "l." b Because the subunits are not exactly equivalent, Papillomaviridae, Polyomaviridae, as well as poliovirus, have "pseudo-triangulation numbers" so are referred to as P = 7, P = 7, and P = 3 symmetries respectively.
doi:10.1016/b978-0-12-373741-0.50005-2 fatcat:4s6ufw2q2fcxzdrv2ougzivgrq