mean diameter 5nm: thickness ~3nm nm
||Lošdorfer Božič A, Šiber A, Podgornik R. Statistical analysis of sizes and shapes of virus capsids and their resulting elastic properties. J Biol Phys. 2013 Mar39(2):215-28. doi: 10.1007/s10867-013-9302-3. abstract, p.6 bottom paragraph & p.12 3rd paragraphPubMed ID23860870
||P.12 3rd paragraph: "Using the statistical analysis [investigators] have shown that capsid proteins of all viruses are similarly sized, prism-like, about 3 nm thick, having an average diameter of 5 nm and an average molecular weight of mprot≈2.7×10^4 amu [atomic mass unit=Dalton]."
||Abstract: "From the analysis of sizes of approximately 130 small icosahedral viruses [investigators] find that there is a typical structural capsid protein, having a mean diameter of 5 nm and a mean thickness of 3 nm, with more than two thirds of the analyzed capsid proteins having thicknesses between 2 nm and 4 nm." P.6 bottom paragraph: "Taken together, [investigators'] analysis shows that the concept of a typical capsid protein is indeed viable – the typical capsid protein is prism-like, about 3 nm thick and has an average diameter of 5 nm."