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degenerate and gene-specific primers

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Hi
Iam trying with combinations of degenerate and gene-specific primers to get some fragments of insect cDNA.
The expected fragments are upto 1800 bp, and i had tried with long range Taq and longer extension times (5 and 7 minutes). But, i donot get a fragment at 1.8 kb , instead i get at 750 bp. or othertimes i get a big smear.
Can anyone help with ideas!
thanks
Kumar
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