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... proteins) to create the mystery of life. Even though most cells in a human body contain the same genes, not all of these genes are used in each cell. Some genes are expressed when they are needed. Many genes are used to specify features unique to each type of cell; for example, liver cells express genes for enzymes that detoxify poisons. To find how each cell achieves such uniqueness, scientists need to discover a way to identify which genes each type of cell possesses (MuhIrad, 2001). Traditionally, one molecular biology experiment is based on one gene at a time; this is a limitation of obtaining the whole picture of gene function. The advent of a DNA array technology during the last few years allows researchers to gain a greater picture of the interactions among thousands of genes simultaneously. It also allows the researchers to look at many genes at once ...