From: (Iris Cohen)

Not impossible, since chlorophyll and hemoglobin differ only in the metal
at
their center.

I was aware of that. Calcium in chlorophyll and iron in hemoglobin

The ring based structure is very similar, differing in only a few bits here and
there. Chlorophyll actually has Magnesium.

Here for Chlorophyll.
http://www.chm.bris.ac.uk/motm/chlor...orophyll_h.htm

Here for Heme. http://omlc.ogi.edu/spectra/hemoglobin/hemestruct/

Sean



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