Figure 1.

Promoter and terminator elements description and entropy index for the transcribed region of the 5S rDNA. A) The promoter of the 5S rDNA contains the elements BoxA, the Internal Element, and the BoxC, altogether called Internal Control Region (ICR). The RNA polymerase recognizes a poly dT as stop signal. B) The entropy index for the 5S rRNA using all the 91 sequences retrieved from the GenBank. However, due the fact that the first 43 nucleotides in Potamotrygon motoro, Potamotrygon falkneri and Paratrygon aiereba transcript region sequences were missing, these were assumed to be equal to those in Urotrygon.