Figure 1. The bacteriophage MS2 and satellite tobacco necrosis virus (STNV) components. (A) Structure of the MS2 phage capsid (inner capsid radius, R_inner~10.5 nm), its genomic map and a cartoon showing the RNA fragments used for the smFCS experiments described here (below). The location of TR is indicated by a blue stripe. (B) Structure of the STNV capsid (inner capsid radius, R_inner~6.0 nm), together with its genomic map and corresponding transcript employed in assembly experiments (1.22 kb, shown in red below). Average hydrodynamic radii of the protein-free RNAs in a polyvalent ion-free buffer (see text) are also shown.