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# Representing Biological Data

- ## Basic sequence data string of letters

- A, C, G, T (DNA)
- A,C,D,E, etc for Amino Acids

- ## Can be represented in several ways

- ## Substitute arbitrary numbers for letters

- e.g. A=1, C=2, G=3, T=4
- doesn’t reflect some properties of the bases
- problems dealing with uncertainty
- Theoretical problems (measurement theory)