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. 1987 Sep;7(9):3027-31.
doi: 10.1128/mcb.7.9.3027-3031.1987.

rRNA genes of Naegleria gruberi are carried exclusively on a 14-kilobase-pair plasmid

C G Clark  1 , G A Cross
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rRNA genes of Naegleria gruberi are carried exclusively on a 14-kilobase-pair plasmid

C G Clark et al. Mol Cell Biol. 1987 Sep.

Abstract

An extrachromosomal DNA was discovered in Naegleria gruberi. The 3,000 to 5,000 copies per cell of this 14-kilobase-pair circular plasmid carry all the 18S, 28S, and 5.8S rRNA genes. The presence of the ribosomal DNA of an organism exclusively on a circular extrachromosomal element is without precedent, and Naegleria is only the third eucaryotic genus in which a nuclear plasmid DNA has been found.

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