[Bioperl-l] counting sequences

[nabula easter]

Dear group,
In a given GenBank file, I want to read the CDS number
and want to chop the sequence based on that number and
then append that choped sequence to my output file.
Would you tell me if there is any bioperl module
abvailable for this. What is the function to count
nucleotide sequence and then chop it based on the CDS
number. 
please help me ASAP. 
thanks 
cheers
Thrio

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