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Open Access Correspondence

Magnetic resonance imaging (MRI) has failed to distinguish between smaller gut regions and larger haemal sinuses in sea urchins (Echinodermata: Echinoidea)

Nicholas D Holland1* and Michael T Ghiselin2

Author Affiliations

1 Marine Biology Research Division, University of California at San Diego, La Jolla, CA, 92093, USA

2 California Academy of Sciences, 55 Concourse Drive, Golden Gate Park, San Francisco, CA 94118, USA

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BMC Biology 2009, 7:39  doi:10.1186/1741-7007-7-39

Published: 13 July 2009

Abstract

A response to Ziegler A, Faber C, Mueller S, Bartolomaeus T: Systematic comparison and reconstruction of sea urchin (Echinoidea) internal anatomy: a novel approach using magnetic resonance imaging. BMC Biol 2008, 6: 33.