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** The barrier has a net negative charge thanks to cells in the membrane having a negatively charged surface and a basal lamina with negatively charged glycoproteins.
 
** The barrier has a net negative charge thanks to cells in the membrane having a negatively charged surface and a basal lamina with negatively charged glycoproteins.
 
** Therefore negatively charged molecules are filtered less than positive or neutral ones
 
** Therefore negatively charged molecules are filtered less than positive or neutral ones
** Proteins are negatively charged this and their size prevents their filtration
+
** Proteins are negatively charged. This and their size prevents their filtration
 
* Protein binding
 
* Protein binding
 
** Drugs, ions or small molecules which are bound to protein are not filtered
 
** Drugs, ions or small molecules which are bound to protein are not filtered
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