insulin: Top view vs side view. The other picture is given in a link below the first one. >>The insulin hexamer viewed down the 3-fold axis, indicating the position of the zinc ions and the three water molecules which coordinate with each of them. A view of the hexamer perpendicular to the 3-fold axis <A HREF="http://www.cryst.bbk.ac.uk/pps97/course/section11/ins_sol4.gif" target="_blank">http://www.cryst.bbk.ac.uk/pps97/course/section11/ins_sol4.gif</A> <<