use strict;
use warnings;
use Data::Dumper;

my $hash = {
  'IL12::1::287' => [6,-17,-9,-21,-24,-15,-2,11,4,4,-15,-26, ...],
  'IL12::1::329' => [-25,-18,-28,23,17,1,-3,-23],

  ...
}
print Dumper($hash);