An icosahedral algal virus has a complex unique vertex decorated by a spike.
Cherrier MV, Kostyuchenko VA, Xiao C, Bowman VD, Battisti AJ, Yan X, Chipman PR, Baker TS, Van Etten JL, Rossmann MG. An icosahedral algal virus has a complex unique vertex decorated by a spike. Proc Natl Acad Sci U S A. 2009 Jul 07; 106(27):11085-9.