frn vs. ffn - Biology Forum

last updated by

mith 16 years, 10 months ago

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- February 25, 2008 at 10:15 am #9165
  az
  Participant
  Greetings
  I need coding sequences of eukaryotes. NCBI ftp contains both frn and ffn files. Can you, please, tell me, what is the difference, and what format I should use for the analysis (it should be cDNAs only)
- February 25, 2008 at 3:11 pm #82237
  mith
  Participant
  there’s a readme file in each folder. I suggest you read it.
  The files are present in the following formats:
  *.asn = ASN.1 file, print form, replaces .prt
  *.faa = FASTA Amino Acid file
  *.ffn = FASTA nucleotide coding regions file
  *.fna = FASTA Nucleic Acid file
  *.gbk = GenBank flat file format
  *.ptt = Protein Table
  *.val = ASN.1 binary format
  *.tar.Z = unix tar and compressed files (not all files are compressed),
  where all of the above files are present. If you want all
  files for a group, all you need is to FTP this one file.
- February 25, 2008 at 5:32 pm #82242
  az
  Participant
  Thanks, but FYI, not all directories in NCBI FTP site contain readme file. That was the reason, I asked for advice.
- February 25, 2008 at 8:47 pm #82257
  mith
  Participant
  my apologies.
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