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Isoelectric point
The ph at which the net charge of the protein is zero. Proteins are positively charged at ph values below their pi and negatively charged at ph values above their pi.

Read more about this term in the Online Textbook:
Proteins and Proteomics: 2D Gel Electrophoresis to Identify Cellular Proteins

Related Terms:
Polyacrylamide gel electrophoresis (PAGE)
2D gel electrophoresis

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View Terms by Unit: Proteins and Proteomics