||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. 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]."
||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. The molecular weight pertaining to these protein dimensions can be estimated well by mprot≈2.7×10^4 amu, and the average number of amino acid residues peaks at ≈200 residues, with an additional smaller peak at ≈390 residues (Fig. 4)."