Acellular background is that which is still present when the cells are removed from the microscope.
1985 — Meyer, David B. (1985). Laboratory Guide for Human Histology. Detroit, Michigan: Wayne State University Press. p. 28. ISBN 9780814318010 – via Google Books (Preview).
The superficial portion of this epithelium is acellular and consists of thin, keratinized fibrous plates which have become artifactually detached during slide preparation (Plate 59, p. 361).
Especially of protists: consisting of only one complex cell.
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