"Eleven nuclei (blue) from an embryo of the bdelloid rotifer Philodina roseola, hybridized with fluorescent probes prepared from cosmids containing approximately 40 kb of genomic DNA. P. roseola has four copies of the hsp82 gene; this image shows fluorescent in situ hybridization (FISH) with copy 3 (red) and copy 4 (green). Each probe hybridizes preferentially to only a single site in each nucleus, demonstrating the absence of nearly-identical alleles of each gene. Image by Jessica Mark Welch."

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