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Am J Physiol Regul Integr Comp Physiol 254: R485-R490, 1988;
0363-6119/88 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 254, Issue 3 485-R490, Copyright © 1988 by American Physiological Society

ARTICLES

Characterization of a broad-scope amino acid transport system in sand dollars

J. P. Davis, S. Bellis and G. C. Stephens
Department of Developmental and Cell Biology, University of California, Irvine 92717.

Both echinoderm embryos and adults take up alpha-amino acids by an apparent broad-scope transport system. This transporter can be characterized as follows: alanine transport is not blocked by alpha-(methylamino)isobutyric acid. Leucine and other lipophilic neutral amino acids are preferentially transported. Transport is sodium dependent and blocked by 2-aminobicyclo-[2,2,1]heptane-2-carboxycylic acid. Lysine and aspartate transport is inhibited by lipophilic neutral amino acids. Taurine, a beta-neutral amino acid, is translocated via a second and independent carrier.




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