Comet parameter: database_name
         
         - A full or relative path to the sequence database, in FASTA format, to search. Example databases
         include RefSeq or UniProt.
         
- Database can contain amino acid sequences or nucleic acid sequences.  If sequences are amino acid
         sequences, set the parameter "nucleotide_reading_frame = 0".  If the sequences are nucleic acid
         sequences, you must instruct Comet to translate these to amino acid sequences.  Do this by setting
         "nucleotide_reading_frame" to a value between 1 and 9.
         
- There is no default value if this parameter is missing.
         
Example:
         
database_name = /usr/local/db/yeast.fasta
         
database_name = c:\local\db\yeast.fasta
         
database_name = yeast.fasta