The name of the file-handle suggests that the input is in FASTA format. The reference article indicates that a file may contain more than one sequence. Each sequence is prefixed with a '>' line which specifies its name and may contain comments. If the input contains more than one sequence, the script combines them. If the file is known to contain only one sequence, it is overkill to test every line for '>'.
Bill

In reply to Re^2: unique sequences by BillKSmith
in thread unique sequences by Anonymous Monk

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