RMDTrackBuilder builder = new RMDTrackBuilder(getToolkit().getReferenceDataSource().getReference().getSequenceDictionary(),
getToolkit().getGenomeLocParser(),
getToolkit().getArguments().unsafe,
getToolkit().getArguments().disableAutoIndexCreationAndLockingWhenReadingRods,
null);
RMDTrack refseq = builder.createInstanceOfTrack(RefSeqCodec.class,refSeqGeneList);
return new SeekableRODIterator(refseq.getHeader(),refseq.getSequenceDictionary(),getToolkit().getReferenceDataSource().getReference().getSequenceDictionary(),
getToolkit().getGenomeLocParser(),refseq.getIterator());
}