NCBI	UCSC	Ensembl
2L	chr2L	2L
2R	chr2R	2R
3L	chr3L	3L
3R	chr3R	3R
4	chr4	4
X	chrX	X
MT	chrM	dmel_mitochondrion_genome
2LHet	chr2LHet	2LHet
2Rhet	chr2RHet	2RHet
3LHet	chr3LHet	3LHet
3RHet	chr3RHet	3RHet
Xhet	chrXHet	XHet
Yhet	chrYHet	YHet
Un	chrU	U
NA	chrUextra	Uextra
