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in reply to How to improve my code? main concern:array as hash element

You can store the reference to an array in your hash:
%gp = ( Gi => [qw[Galpha-i1 Galpha-i2 Galpha-i3]],
      );
print $gp{Gi}[1];

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See also perlref.

In Section Seekers of Perl Wisdom