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degenerate primers

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i had been trying out the degenerate primers with cDNA libraries. I have few questions:
1) why do i get many bands instead of our expected fragment alone?
2) how to differentiate between the bands that are formed by primer dimers and the bands out of sheer complimentarity?
3) should the expected fragment be present at the exact bp lenght or can it be little more?
senthil kumar
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