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	How many different types of DNA can you get? Rose in Peterborough
	There are two answers to this question. One is that there is only a single type of DNA, as it's all made up of the same basic codes. However, there are certain sub-types of DNA. These include cDNA, which stands for coding DNA, and single stranded DNA, which looks like a ladder cut in half.
	November 2005

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Listen to this as part of the show: 20th Nov 2005 - Genetics, DNA Extraction and the Human Genome Project
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