Light and electron microscopy of <i>S</i>. <i>marcescens</i> strain ITBB B5-1.

<p>A, Morphology of the clones on LB plates; B, light microscopy image of the bacterial cells (black arrows) and the extracellular vesicles (white arrows) shown by their original red color, scale bar = 0.5 μm; C, Light microscopy of the pelleted bacterial cells, white arrows indicate the fused vesicles in natural color, scale bar = 2 μm; D, Scanning electron microscopy, scale bar = 0.5 μm; E, Transmission electron microscopy, white arrow indicates the intracellular structure, scale bar = 0.5 μm; F, The cell wall structure under transmission electron microscope, scale bar = 0.1 μm.