Daytime compartmentalized guild interaction classes. All 74,507 elementary modes identified in the daylight compartmentalized model, binned into 16 classes of guild interactions. Number of modes belonging to each classification is listed in lower right. Columns from left to right contain interaction classes requiring an increasing number of inter-guild metabolite transfers. Abbreviations: PG, polyglucose; PHB, polyhydroxybutyrate; syn, cyanobacteria (i.e. Synechococcus).