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