Term Name:	porin activity
Synonyms:	outer membrane exporter porin, porin
Definition:	Enables the transfer of substances, sized less than 1000 Da, from one side of a membrane to the other. The transmembrane portions of porins consist exclusively of beta-strands which form a beta-barrel. They are found in the outer membranes of Gram-negative bacteria, mitochondria, plastids and possibly acid-fast Gram-positive bacteria.
Ontology:	GO: Molecular Function [GO:0015288]    QuickGO    AmiGO