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Modern techniques in molecular biology, genomics, and mass spectrometry–based proteomics have identified a large number of novel histone posttranslational modifications (PTMs), many of whose func-tions are still under intense investigation. Here, we catalog histone PTMs under two classes: first, those whose functions have been fairly well studied and, second, those PTMs that have been more recently identified but whose functions remain unclear. We hope that this will be a useful resource for researchers from all biological or technical backgrounds, aiding in their chromatin and epigenetic pursuits