my $valid_protein = 'no valid protein';

if($min == 0)
{
    $scoring = 1;
    $valid_protein = $each_protein;
}
elsif($min == 1)
{
    $scoring = 0.5;
}
else
{
    $scoring = 0.2;
}

print $fh "$fields[0], $field2, $valid_protein, $field3, $min, $scoring\n";