public NucleotideAlphabet(AlphabetType nucleotideAlphabet, GeneticCode geneticCode)
        {
            if (nucleotideAlphabet == AlphabetType.ExtendedProtein || nucleotideAlphabet == AlphabetType.StandardProtein)
            {
                throw new ArgumentException(String.Format(AlphabetDataProvider.InvalidNucleotideAlphabet, nucleotideAlphabet));
            }

            GeneticCode        = geneticCode;
            AllowedSymbols     = AlphabetDataProvider.GetAllowedNucleotideSymbols(nucleotideAlphabet);
            ComplementTable    = AlphabetDataProvider.GetComplementTable(nucleotideAlphabet);
            TranscriptionTable = AlphabetDataProvider.GetTranscriptionTable(nucleotideAlphabet);
            TranslationTable   = AlphabetDataProvider.GetTranslationTable(geneticCode, nucleotideAlphabet);
            GcContentSymbols   = AlphabetDataProvider.GcContentSymbols(nucleotideAlphabet);
        }
        internal ProteinSequence(NucleotideSequence seq)
        {
            if (seq.ActiveAlphabet == AlphabetType.StrictDna || seq.ActiveAlphabet == AlphabetType.StrictRna)
            {
                if (seq.Sequence.Length % 3 != 0)
                {
                    throw new ArgumentException("Sequence length is not evenly divisible by three, which means it cannot be translated because you are using a strict nucleotide alphabet");
                }
            }

            AlphabetType alphabet;
            var          allowedSymbols = new HashSet <AminoAcid> {
                AminoAcid.Stop, AminoAcid.Gap
            };

            switch (seq.ActiveAlphabet)
            {
            case AlphabetType.AmbiguousDna:
                alphabet = AlphabetType.ExtendedProtein;
                allowedSymbols.UnionWith(AlphabetDataProvider.ExtendedProtein);
                break;

            case AlphabetType.AmbiguousRna:
                alphabet = AlphabetType.ExtendedProtein;
                allowedSymbols.UnionWith(AlphabetDataProvider.ExtendedProtein);
                break;

            default:
                alphabet = AlphabetType.StandardProtein;
                allowedSymbols.UnionWith(AlphabetDataProvider.StandardProtein);
                break;
            }
            var translationTable = new Dictionary <string, AminoAcid>(AlphabetDataProvider.GetTranslationTable(seq.GeneticCode, seq.ActiveAlphabet));

            //string safeSequence, AlphabetType alphabet, GeneticCode geneticCode, Dictionary<Nucleotide, long> symbolCounts
            ActiveAlphabet   = seq.ActiveAlphabet;
            _proteinAlphabet = new ProteinAlphabet(alphabet, seq.GeneticCode);

            var proteinBlob = Translate(seq.Sequence, translationTable);

            Sequence     = proteinBlob.Sequence;
            _aminoCounts = proteinBlob.AminoCounts;
        }