Comparative analysis of marker order on chicken chromosome 4 (GGA4) and its zebra finch orthologs, TGU4 and TGU4A. The central part of the figure was created by aligning whole-chromosome sequences using the program GenAlyzer (Choudhuri et al. 2004). Line color between chromosome bars indicates the lengths of sequences exhibiting 100% sequence identity (between 100 and 900 bp). The rearrangements suggested by this analysis were verified using fluorescent in situ hybridization (FISH). Numbers indicate the positions of chicken and zebra finch bacterial artificial chromosome (BAC) clones with orthologous sequence content in the genome sequences of both species. Yellow dots illustrate the physical position as determined by FISH.
