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. 2014 Mar 14;9(3):e91820. doi: 10.1371/journal.pone.0091820

Figure 2. Total number of rDNA units and R2 elements determined for males carrying (+) or lacking (O) B chromosomes.

Figure 2

Animals were obtained from five populations in Spain. Top panel, total number of R2 elements; Bottom panel, total number of rDNA units. 1, male with two B chromosomes; 2, male with a B chromosome that appears to have arisen from the fusion of two B chromosomes.