bacterial biofilm matrix obsolete bacterial biofilm matrix component true cellular_component Note that this term is in the subset of terms that should not be used for direct gene product annotation. Instead, select a child term or, if no appropriate child term exists, please request a new term. Direct annotations to this term may be amended during annotation QC. OBSOLETE. Any constituent part of the biofilm matrix, a structure lying external to bacterial cells. A biofilm is an aggregate of surface-associated bacteria, and the biofilm matrix is the envelope of polymeric substances that surrounds the bacteria. pr biofilm matrix part 2012-05-24T11:22:56Z GO:0097312