We examined the phylogenetic distribution of the 128 organisms that lack the CCUCCU antiSD. They were concentrated in the Phylum Bacteroidetes, Genus Chryseobacterium, Elizabethkingia, Riemerella, and Blattabacterium, and also in Tenericutes (Genus Mycoplasma), and Proteobacteria (Genus Candidatus Carsonella), (shown below). Other members of some of these same groups were found as organisms that have a CCUCCU antiSD, but where no matching SD was found by the Tompa method. Thus, these may be groups of organisms that systematically use some alternative method of translation initiation. In addition, sporadic organisms lacking a CCUCCU antiSD, and also lacking a strong SD as defined by the Tompa method, were also found in many other genera (most of these were within the phyla Bacteroidetes, Tenericutes, Firmicutes, or Proteobacteria).