Insulin Hexamer

The three models are of an insulin hexamer. Three molecules of insulin are coordinated by a zinc ion to form a trimer. Two of these trimers are interlocked to form the hexamer.
https://en.wikipedia.org/wiki/Insulin

The structure was taken from the protein database:
https://www.rcsb.org/structure/1aiy

In this particular case, the data of the three-dimensional solution structure of the phenol-stabilized 36 kDa R6 insulin hexamer was determined by NMR spectroscopy and restrained molecular dynamics. The paper can be found here:
X. Chang, A. M. Jørgensen, P. Bardrum, J. J. Led, Biochemistry-Us 1997, 36, 9409–9422.
https://pubs.acs.org/doi/10.1021/bi9631069

Water and phenol molecules where deleted from the structural data and STLs were made with VDM.
The file endings 07, 08, and 10 denote the factor that was used on the van der Waals radius, meaning 0.7, 0.8 or 1.0. At a factor of 1.0 you will have the most realistic view, but it is very bulky. At 0.7 the structure becomes mo