code: public String getConceptualTranslation() {
          if (codons == null) {
              return "";
          }        
          StringBuilder translation = new StringBuilder();
          for (int i = 0 ; i < conceptualTranslationCodons ; ++i) {
              Codon codon = codons.get(i);
              translation.append(codon.getAminoAcid());
          }
          return translation.toString();
      }
docs: Returns the translation excluding stop codons
  and trailing bases.
  @return the translation excluding stop codons
  and trailing bases.