Unimod browser

Search the Unimod database of mass spectrometry modifications by name, formula, site, classification or delta mass. The data is the Unimod release bundled with the unimodpy Python package; the page runs in your browser and sends nothing anywhere.

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Matches the ID, name, formula, synonyms and definition (case-insensitive substring). Classification, site and position must match the same specificity.

Delta-mass search

Signed mass shift, e.g. 79.9663 or -18.0106. Hits are sorted by |Δ error|, closest first; see Methods below.

Phosphorylation, +79.966331 Da ± 0.01 Da.

Modifications

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Δ formula Sites Classifications
About this tool / Methods

Each row is one modification in Unimod (the release bundled with unimodpy). A modification can have several specificities: a site (residue or terminus), a position and a classification each.

  • Δ mass, mono: the monoisotopic mass difference of the modification (delta_mono_mass). Average: delta_avge_mass.
  • Δ formula: the delta composition in ProForma Hill notation (proforma_formula).
  • Sites and Classifications list the distinct values over all specificities.