Inhibition requires growing together.

Aflatoxin B1 production (ppb) in the filter insert-plate well system by toxigenic isolate 53 growing together with or separated from various atoxigenic isolates by a 0.4 µm pore size filter insert membrane.1Mix: Toxigenic 53 and atoxigenic isolates mixed together in and under filter.2T/A: Toxigenic 53 in filter and atoxigenic isolate under filter.3A/T: Atoxigenic isolate in filter and toxigenic 53 under filter.4Check: 53 in filter and only medium under filter.*Means followed by the same letter are not significantly different at the α = 0.05 level.