periplast


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periplast

[′per·ə‚plast]
(cell and molecular biology)
A cell membrane.
A pellicle covering ectoplasm.
(histology)
The stroma of an animal organ.
(invertebrate zoology)
The ectoplasm of a flagellate.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Dodge and Crawford (1970), in their investigation of the "periplast" of zooxanthellae, agreed with Taylor, stating that "it is impossible to tell whether these [membra nes] belong to the host or alga." Undaunted by this proclamation, many papers have been published suggesting possible origins for these membranes.
These results suggest an alternative hypothesis for the origin of the multilayered "periplast" or "symbiosome membrane" that is prevalent around the dinoflagellate symbionts found in invertebrate hosts.