2L	chr2L
2LHet	chr2LHet
2R	chr2R
2RHet	chr2RHet
3L	chr3L
3LHet	chr3LHet
3R	chr3R
3RHet	chr3RHet
4	chr4
U	chrU
Uextra	chrUextra
X	chrX
XHet	chrXHet
YHet	chrYHet
dmel_mitochondrion_genome	chrM