What is p40? p40 is a protein that is made by many different kinds of normal healthy cells including squamous cells, basal cells, and myoepithelial cells. Tumours that start from these types of specialized cells also make p40. Once the p40 protein is made it is held in a part of the cell called the …
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What does immunoreactivity mean? Immunoreactivity is a word pathologists use to describe the results of a test called immunohistochemistry. This test is performed to see if the cells in a tissue sample make a protein of interest. Cells that make the protein may be described as reactive or positive. Cells that do not produce the …
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What does IHC mean?

IHC stands for immunohistochemistry. Immunohistochemistry is a special test that pathologists perform on tissue to aid them in making a diagnosis. Immunohistochemistry allows pathologists to highlight groups of cells based on the chemicals those cells are making. Immunohistochemistry is usually performed on tissue after the more common H&E stain has performed. For this reason, immunohistochemistry …
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