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Gregarine attachment organelles — structure and permeability of an interspecific cell junction

Published online by Cambridge University Press:  06 April 2009

W. G. MacMillan
Affiliation:
Biophysical Chemistry Unit, Department of Chemistry, University of Aberdeen, Scotland

Extract

The junction between the gregarine trophozoite Nematocystis magna Schmidt and an epithelial cell of its earthworm host Lumbricus terrestris Muller consists of an extensive folding and meshing of the single trilaminar membrane bounding the host cell and the complex folded multilaminar limiting membrane of the trophozoite. They are separated by a structureless intercellular region of some 50 nm in width. Specialized communicating regions or permeable elements were not observed. Transport of a radioactive label across non-junctional and junctional membranes was demonstrated by using tritiated glucose. The attachment organelle of the trophozoite is shown to be capable of allowing metabolites to pass into the cell directly from the host tissue.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1973

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