Abstract
Gene expressions are different depending on tissue types and developmental stages. It is important to analyze how each gene is expressed. One way of analyzing the gene expression pattern is to find the tissue-specific functions. It is useful to understand how vital activities go on. Nowadays, DNA microarray has been widely used to observe gene expressions exhaustively. However, it is impossible to compare the expression value of a gene to that of the other genes because the gene expression value of a condition is measured as a proportion of that of the same gene at a control condition. Therefore, we cannot determine whether one gene is more expressed than the other genes or not and what is the tissue-specific function.
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