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Fig. 5. Escapin has a very long antimicrobial shelf-life at room temperature. E. coli cells in stationary phase were grown as a lawn on solid medium and tested in a plate assay for ability of escapin to inhibit growth. Escapin was tested at concentrations of 3-125 µg ml-1, under two conditions: `Fresh': freshly isolated; `5 months': after storage for 5 months at room temperature.