A new statistical method associating each trinucleotide with a frame is developed for
identifying circular codes. Its sensibility allows the detection of several circular codes in the
(protein coding) genes of archaeal genomes. Several properties of these circular codes are
described, in particular the lengths of the minimal windows to retrieve the construction
frames, a new definition of a parameter for measuring some probabilities of words generated
by the circular codes, and the types of nucleotides in the trinucleotide sites. Some biological …