On Tue, 3 Feb 2004 07:40:44 +0000 (UTC), "Bartosz Milewski"
 wrote:

>I had no idea hemoglobin was so old. Is there, by any chance, a similar
>paper on the history of the chlorophyll gene?
>Bartosz
>
Try
  DH Burke, JE Hearst, and A Sidow
  Early Evolution of Photosynthesis: Clues from Nitrogenase \
    and  Chlorophyll Iron Proteins
  PNAS 1993; 90: 7134-7138. 
  http://www.pnas.org/cgi/reprint/90/15/7134.pdf

or 
  PETER J. LOCKHART*, ANTHONY W. D. LARKUM†, MICHAEL A. STEEL‡, 
     PETER J. WADDELL*, AND DAVID PENNY*
 Evolution of chlorophyll and bacteriochlorophyll: The problem 
    of invariant sites in sequence analysis
  Proc. Natl. Acad. Sci. USA 93, pp. 1930–1934, March 1996
  http://www.pnas.org/cgi/reprint/93/5/1930.pdf
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