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SYNOPSIS. Studies on the nudeohis in various species of Amphibia, including the Mexican axolotl, have contributed to an understanding of the function of the nucleolar organizing region. In the first part of this paper we have reviewed some of the research on nucleolar variants in the axolotl. These variants were recognized in different strains of laboratory reared animals. The phenotypes include diminished nucleolar size and possible alterations in the levels of rDNA. The expression of severaldoi:10.1093/icb/18.2.225 fatcat:zvjrei4gcnhgxkx3v7xst5ze2m