Little is understood of the extracellular polymeric substances and metabolites produced by these organisms. Also, little is understood of the cellular debris which remains after cell death. There are no specific Ph.Eur tests specified to test for some of these EPS and metabolites. Some of these include Exotoxins and Bacterioclns (piocins, colicins) as well as endotoxins (for which a number of test methods are prescribed in the Ph.Eur.)