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Molecular mechanisms determining methylation patterns in eukaryotic genomes still remain unresolved. We have characterized, in Ascobolus, a gene for de novo methylation. This novel eukaryotic gene, masc1, encodes a protein that has all motifs of the catalytic domain of eukaryotic C5-DNA-methyltransferases but is unique in that it lacks a regulatory(More)
A nomenclature is described for restriction endonucleases, DNA methyltransferases, homing endonucleases and related genes and gene products. It provides explicit categories for the many different Type II enzymes now identified and provides a system for naming the putative genes found by sequence analysis of microbial genomes.
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