Positional distribution of TA-like signals to translation initiation site (TIS) in bacteria. Four bacterial genomes are: Streptomyces coelicolor A3(2) (Actinobacteria); Deinococcus radiodurans R1 (Deinococcus-Thermus); Aquifex aeolicus VF5 (Aquificae); and Lactococcus lactis subsp. lactis Il1403 (Firmicutes). Y axis shows the frequency that a signal located X bps, counted from the first "T" in the "TANNNT" core, upstream to TIS is a Pribnow box. The position of TIS is defined as 0.