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motif discovery for small set of genes

Hi there, I am not familiar with motif discovery and I have a question, I have a small set of genes extracted from microarray data and I want to know transcription factors binding site and finding motifs for these small number(27 genes) with Opossum. the first question is that is motif discovery logical for a small set of genes? if so would it good to divide genes to two list, repressed genes and activate genes and then finding motifs to find the better result?

motif gene expression

Where are these motifs supposed to be? You have microarray data, not sequences. Do you want motifs in the promoter regions? Your question is unclear.

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