Anionic sites on proteoglycans in the renal glomeruli that restrict filtration of anionic molecules and facilitate filtration of cationic proteins; loss of p. may cause albuminuria in lipoid nephrosis.

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poly·an·ion .päl-ē-'an-.ī-ən n a molecule or chemical complex having negative charges at several sites
poly·an·ion·ic -.an-(.)ī-'än-ik adj

Medical dictionary. 2011.

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