code: public static void writeFasta(final OutputStream os,
  		final List<FastaSequence> sequences) throws IOException {
  	final OutputStreamWriter outWriter = new OutputStreamWriter(os);
  	final BufferedWriter fasta_out = new BufferedWriter(outWriter);
  	for (final FastaSequence fs : sequences) {
  		fasta_out.write(fs.getOnelineFasta());
  	}
  	fasta_out.close();
  	outWriter.close();
  	}
docs: Writes FastaSequence in the file, each sequence will take one line only
  
  @param os
  @param sequences
  @throws IOException