"HistoneDB 2.0 – with variants" is a comprehensive database of histone protein sequences including histone variants, classified by histone types and variants maintained by National Center for Biotechnology Information. Entries in the database include sequence and structural annotations with many interactive tools to explore and compare sequences of different variants from various organisms. The core of the database is a manually curated set of histone sequences grouped into 30 different variant subsets with variant-specific annotations. The curated set is supplemented by an automatically extracted set of histone sequences from the non-redundant protein database using algorithms trained on the curated set. The interactive web site supports various searching strategies in both datasets: browsing of phylogenetic trees; on-demand generation of multiple sequence alignments with feature annotations; classification of histone-like sequences and browsing of the taxonomic diversity for every histone variant. HistoneDB 2.0 is a resource for the interactive comparative analysis of histone protein sequences and their implications for chromatin function.
^Draizen EJ, Shaytan AK, Marino-Ramirez L, Talbert PB, Landsman D, Panchenko AR (2016). "HistoneDB 2.0: a histone database with variants--an integrated resource to explore histones and their variants". Database : the journal of biological databases and curation. doi:10.1093/database/baw014. PMID26989147.
