Distribution of 2R proto-Actinopterygian ancestral chromosome affinities in the genome of three-spined stickleback (Gasterosteus aculeatus). Chromosomes are all acrocentric and are arranged with centromeres at the top. 2R ancestral chromosome designations follow the convention of Kasahara et al. (2007) . Syntenic affinities are colour-coded as per the legend on the bottom left-hand corner. The size of each chromosome is denoted in millions of base-pairs at the bottom of each chromosome and was obtained from ENSEMBL v60 .
Norman et al. BMC Genomics 2012 13:420 doi:10.1186/1471-2164-13-420