outputStream.close();
    private void writeChromosomeFasta(File destinationDirectory, Chromosome chr)        throws IOException, ChangeVetoException, IllegalArgumentException, IllegalSymbolException {        FileOutputStream outputStream =            new FileOutputStream(chromosomeFastaFile(destinationDirectory, chr));                FlyMineSequence sequence = FlyMineSequenceFactory.make(chr);                if (sequence != null) {            sequence.getAnnotation().setProperty(FastaFormat.PROPERTY_DESCRIPTIONLINE,                                                 chromosomeFileNamePrefix(chr));            SeqIOTools.writeFasta(outputStream, sequence);        }    }