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Histology is the study of biological structures at the microscopic level.
Traditionally visualisation of cells and components has been made possible by the use of stains, which react with components present in some cells, but not others.
In microbiology, this gave rise to the classification of bacteria as to whether the bacterial cell absorbed a particular stain, namely Gram Positive or Gram Negative.
In society histology is most often seen in hospitals, where human
cells within blood and other tissues, are studied for signs of disease.
[see also Medical Histology and Histopathology]
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