Figure 3
From: Relationship of SARS-CoV to other pathogenic RNA viruses explored by tetranucleotide usage profiling
3-D plot for the vectorial profiling of each virus onto the three eigen-vectors. The tetra-nucleotide usage patterns V for the replicase open reading frame in each virus have been redisplayed on the 1st, 2nd and 3rd eigen-vector axes ('o' represents positive strand ss RNA virus; x represents negative strand ss RNA virus). The two families of viruses clustered into two different regions of the plot.