© 2001 by European Society of Cardiology
Copyright © 2001, European Society of Cardiology
Controlling collateral development: the difficult task of mimicking mother nature
aDepartment of Cardiology, Coimbra University Hospital, 3049 Coimbra Codex, Portugal
bCardiovascular Research Institute of the MedStar Research Institute, Washington Hospital Center, 110 Irving Street, NW, Suite 4B1, Washington DC, USA
cHartcatheterisatie B2-109, Academisch Medisch Centrum, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
* Corresponding author. Tel.: +351-39-400-414; fax: +351-39-780-552 lgoncalv@ci.uc.pt sxe2@mhg.edu j.j.piek@amc.uva.nl
Received 7 November 2000; accepted 7 November 2000
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In small animals with a relatively simple structure and organization, direct diffusion is sufficient for the transport of nutrients, gases and waste materials to and from individual cells. However, in the evolution of the higher metazoan animals, some cells become distant from the external environment, creating evolutionary pressure for selection of those with rudimentary circulatory systems [1]. Thus, large multicellular organisms developed complex, cell-lined, vascular systems, allowing transport of water, ions and nutrients to remote parts of the organism, and removal