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Chromosome 18 is one of the 23 pairs of chromosomes in humans. People normally have two copies of this chromosome. Chromosome 18 spans about 80 million base pairs (the building material of DNA) and represents about 2.5 percent of the total DNA in cells. Identifying genes on each chromosome is an active area of genetic research. Because researchers use different approaches to predict the number of genes on each chromosome, the estimated number of genes varies. Chromosome 18 likely contains between 300 and 400 genes. ==Genes== The following are some of the genes located in chromosome 18: * DCC: Deleted in Colorectal Cancer * FECH: ferrochelatase (protoporphyria) * NPC1: Niemann-Pick disease, type C1 * SMAD4: SMAD, mothers against DPP homolog 4 (Drosophila) * KC6: Keratoconus gene 6, discovery reported in 2005; 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chromosome 18 (human)」の詳細全文を読む スポンサード リンク
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