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PCR using DNA from agarose gel

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 Hi all,
I have a problem with my gel eluted 4kb DNA fragment PCR amplification. After Gel elution I got around 40ng/microliter of DNA concentration and I use 2 microliter out of this for PCR. But I always get a bad smear on my gel picture instead of a specific band. Can anyone help me on how to fix this problem?
My PCR programme is as the following,
1. 94°C - 2 min
2. 94°C - 45 sec
3. 58°C - 45 sec
4. 72°C - 4 min
5. Goto step 2 and repeat 29 times
6. 72°C - 7 min
7. 4°C END
Thanks in advance,
Bests,
DG
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