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Biol Bull 167: 495-500. (October 1984)
© 1984 Marine Biological Laboratory
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PROLINE BETAINE: A UNIQUE OSMOLYTE IN AN EXTREMELY EURYHALINE OSMOCONFORMER

SIDNEY K. PIERCE 1, SAMUEL C. EDWARDS 1, PAUL H. MAZZOCCHI 2, LORI J. KLINGLER 2, and MARY K. WARREN 1

1 Department of Zoology, University of Maryland, College Park Maryland 20742, and Marine Biological Laboratory, Woods Hole, Massachusetts 02543
2 Department of Chemistry, University of Maryland, College Park Maryland 20742

The extremely euryhaline mollusc, Elysia chiorotica, does not utilize intracellular free amino acids for cell volume regulation during osmotic stress. Instead, Elysia utilizes an osmolyte previously unknown from animals, proline betaine. Although proline betaine occurs in some plants and Elysia forms a symbiosis with an algae, the proline betaine in Elysia seems to be a product of the animal.

Submitted on June 27, 1984
Accepted on July 17, 1984






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