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README

The GenPak (GP) package contains many command-line utilities which
fullfill a whole bunch of tasks, from DNA sequence searches to
restriction analysis and determining the melting temperature of
oligonucleotides. GP utilities can convert DNA / RNA to protein,
determine codon usage / GC contents, do promotor searches, calculate
Tm, search for restriction sites, convert sequences into numerical
representations and much more.

You most likely want to install Arka, which provides a GUI for GenPak.