These 13 mers are chosen from the common upstream promoter region of
genes 155875 and 155853. They are 3 times more likely to appear in the
top 531 upregulated genes than usual. Some of them could possibly be combined
to give larger motif. Especially we notice many of them to have "AAAA/TTTT"
subsequence. It is likely that the core of the key motif matches AAAA/TTTT.

TTCGGGAATACTC
TTTCGGGAATACT
TAGAGCCAACGAG
GATTTTCCACGAT
ACTTTTAAAGCTA
TTTTCCACGATAT
TTTCCACGATATT
GACGCTTCGAGAA
GAACTCACCGATG
CGACGCTTCGAGA
GCAACAACTTTTA
TGCGTTGTTAATC
AACTTTTAAAGCT
TTTTCGGGAATAC
TCGTGGAAAATCT
AACTCACCGATGA
TATCGTGGAAAAT
ACGCTTCGAGAAG
CGTTGTTAATCAT
CAACAACTTTTAA
TGAACCCATTTTT
TCGGGAGTATTCC
CTAGAGCCAACGA
GCGTTGTTAATCA
CCATTTCGGTGAA
AACAACTTTTAAA
TCACGATAAATGG
AAAACAGAGATAT
CGAGCAACAACTT
TTTAAAGCTAGCC
TTCTAGAGCCAAC
ACTTGTCATTGTA
CTTCTAGAGCCAA
TATTGCAAAATCA
TTCTGAACCCATT
CGGGACAATATCG
CCGACGCTTCGAG
AGCCTTTCGGGAA
TCTGAACCCATTT
CGCTTAAGCGAAG
ACCGACGCTTCGA
CGGGAGTATTCCC
ACTCACCGATGAT
CAACTTTTAAAGC
AGAGCCAACGAGA
TCCATTTCGGTGA
CCGAAATGGACCG
CGCCGAAAGTTCC
GCTCGCAGTTTTC
TTAATAGGAGCAC
GGGAATACTCCCG
AAAGCTAGCCCGA
GACTTCCAGATTT
CATTTCGGTGAAG
GAAAACAGAGATA
ACGATAAATGGCT
AACTCTTTGCTCG
TATTAAAACCCCG
GGAGTATTCCCGA
ATTAACAACGCAC
ATATTCGGCATCA
AGATTTTCCACGA
CGCTTCTCGAAGC
TTCCCGAAAGGCT
CTTCGAGAAGCGG
CGACTTCCAGATT
CACGATAAATGGC