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The category groups proteins that have an intermediate isoelectric point (pI), and therefore tend to be roughly neutral in charge at physiological pH (7.4).

Quantitatively, proteins in this category have a charge q at physiological pH and a number of residues N such that

$ \left| \frac{q}{\sqrt{N}} \right| < 0.25 $

This criterion is met by roughly one-third of the proteins in Arabidopsis thaliana.

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