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Haem Structure and Function

  1. Maria da Graça H Vicente,
  2. Kevin M Smith

Published Online: 19 APR 2001

DOI: 10.1038/npg.els.0000605



How to Cite

Vicente, M. d. G. H. and Smith, K. M. 2001. Haem Structure and Function. eLS. .

Author Information

  1. University of California–Davis, California, USA

Publication History

  1. Published Online: 19 APR 2001


Haems are the vital catalysts in a large number of biological processes, including oxygen transport, oxygen storage, electron transport and oxygenation. Haem proteins contain an iron complex of porphyrin, usually protoporphyrin IX, and exist in haemoglobin, myoglobin, cytochromes, catalases, peroxidases, oxygenases and oxidases.


  • haemoproteins;
  • haemoglobins;
  • cytochromes;
  • catalases;
  • peroxidases