DNA Sequencing, Mutation and Repair
Differentiation of four different bases in automated sequencing systems is that each base has

different radioactive tag
cytosine at start
distinctive fluorescent tag
unique antibody bound to it

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DNA Sequencing, Mutation and Repair
A mutagen is defined as

an inhibitor of gene modification
an enzyme that repairs mutations
a molecule which stabilizes DNA thus prevents mutations from occurring
a chemical or physical agent that induces mutations

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