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Constitutive heterochromatin and nucleolus organizer region in the knifefish,Apteronotus albifrons (Pisces, Apteronotidae)

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Summary

The C-banding and silver staining of the chromosomes of the knifefishApteronotus albifrons (2n=24), demonstrated the presence of constitutive heterochromatin in the centromeric region of every chromosome, except pair 4, where the entire long arm was darkly stained, the silver stain positive nucleolus organizer region (NOR) being embedded in it.

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Authors and Affiliations

  1. Instituto de Biociências da Universidade de São Paulo, S.P.

    Lurdes F. de Almeida Toledo, F. Foresti & S. de Almeida Toledo

  2. Departamento de Morfologia, IBBMA, Universidade Estadual Paulista Júlio de Mesquita Filho, Campus de Botucatu, S.P., Brasil

    Lurdes F. de Almeida Toledo, F. Foresti & S. de Almeida Toledo

Authors
  1. Lurdes F. de Almeida Toledo
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  2. F. Foresti
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  3. S. de Almeida Toledo
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Additional information

The authors are grateful to Dr Sen Pathak (University of Texas System Cancer Center at Houston, Texas, USA) and Dr Yatiyo Yassuda (Universidade de São Paulo, São Paulo, Brasil) for their suggestions. This study was supported in part by grants of the Conselho Nacional de Desenvolvimento Cientifico e Tecnológico (CNPq).

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de Almeida Toledo, L.F., Foresti, F. & de Almeida Toledo, S. Constitutive heterochromatin and nucleolus organizer region in the knifefish,Apteronotus albifrons (Pisces, Apteronotidae). Experientia 37, 953–954 (1981). https://doi.org/10.1007/BF01971773

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