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Karyotype of Gymnotus carapo from Almeirim, Pará, Brazil, with a diploid number of 2n = 40: A. Conventional Giemsa stained karyotype with the NOR pair (20); B. Sequenced C-banding; C. DAPI stained karyotype, the arrows indicate interstitial markings; D. CMA3 stained metaphase (the arrows indicate the NOR pair). M-SM = Metacentric – Submetacentric; ST-A = Subtelocentric – Acrocentric.
