On Mon, 16 Dec 2019 at 17:44, Kenneth Barns <xxxxxx@gmail.com> wrote:

As a completely different option - how about a simplified immunoglobulin monomer structure, the 4-part "Y"?  http://www.biology.arizona.edu/immunology/tutorials/antibody/structure.html

Or better yet, the 4-part Y with a solid circle for the implied head?

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Cheers,
Ken