From: Characterizing exons and introns by regularity of nucleotide strings
s 1
s 2
s 3
ACGT
AGCT
ATCG
ACTG
AGTC
ATGC
CAGT
GACT
TACG
CATG
GATC
TAGC
GTAC
CTAG
CGAT
GTCA
CTGA
CGTA
TGAC
TCAG
GCAT
TGCA
TCGA
GCTA