capable of porin Beta barrel membrane transport protein that acts as a diffusion channel for small molecules. [This is an external definition] http://purl.obolibrary.org/obo/fma.owl Imported from FMA because we needed a general class for porins, as opposed to the specific types found in the Protein Ontology -SB [12/18/2020] Porins are present in the outer membrane of gram-negative bacteria and some gram-positive mcyobacteria. Porins serve as specific receptors for some bacteriophages. Shane Babcock (external definition and axioms) porin activity protein