Figure 1

Physical characteristics of viruses before and after labeling with PKH67.
(a) SMV1, (b) SMV1-PKH67, (c) SSV2, (d) SSV2-PKH67. Left panel: Transmission electron micrographs of viruses; Middle: Typical size distribution profile and concentration of viral preparations determined by Nanoparticle Tracking Analysis; Right panel: 2D plots of relative light scattering intensity of viruses versus the estimate of their size.