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No major differences in chromosome morphology or probe hybridization between 11 G. aculeatus and A. quadracus chromosome pairs. Two-color FISH images are shown for both homologs of each chromosome pair. White arrowheads indicate the position of the centromere. One FISH probe for chromosome 19 does not hybridize to the metacentric Y chromosome, most likely due to a large deletion on the Y chromosome in G. aculeatus [Ross and Peichel, 2008].
