  By means of the nonlinear modeling technique (NM technique), we find the
nonlinear deterministic structures in the promoter regions (PPRs) of DNA
sequences, called deterministic valleys (DVs) in this paper. These DVs prefer
to occur much more outside of a special region around TSS. The number,
positions and shapes of the DVs are basically different for different PPRs.
Generally, these DVs do not occur in the CpG islands, which tells us that they
should be special structures with new biological functions rather than the CpG
islands. PACS numbers: 87.14.Gg, 87.10.1e, 05.45.2a
