The transcription-translation process is represented by a virtual neur
al network. The input unit corresponds to the transcription process, t
he hidden unit to the mRNA-ribosome-tRNA interaction and the output un
it to the final state of the protein. A correlation was found between
the natural amino acid frequency and the degree of codon degeneracy an
d an inverse correlation between the code degeneracy and the number of
amino acid substitutions in the protein.