code: public static void writeGeneSequence(OutputStream outputStream, Collection<GeneSequence> geneSequences,boolean showExonUppercase) throws Exception {
  		FastaGeneWriter fastaWriter = new FastaGeneWriter(
  				outputStream, geneSequences,
  				new GenericFastaHeaderFormat<GeneSequence, NucleotideCompound>(),showExonUppercase);
  		fastaWriter.process();
  
  	}
docs: Write a collection of GeneSequences to a file where if the gene is negative strand it will flip and complement the sequence
  @param outputStream
  @param dnaSequences
  @throws Exception