defined:

A noncoding sequence of DNA that is initially copied into RNA but is cut out of the final RNA transcript.

explained:

Listen to a detailed explanation. (Requires the free RealPlayer download)

Dr. Jennifer Puck, formerly of the National Human Genome Research Institute's Genetics and Molecular Biology Branch, defines intron.

illustrated:

View illustration

related
terms:

deoxyribonucleic acid (DNA), gene, ribonucleic acid (RNA), genetic code (ATGC), chromosome

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