The Phospho.ELM resource is a relational database designed to store in vivo and in vitro phosphorylation data extracted from the scientific literature and phosphoproteomic analyses. The resource comprises serine, threonine and tyrosine non-redundant phosphorylation sites. New features include: structural disorder/order and accessibility information and a conservation score. Additionally, the conservation of the phosphosites can be visualized directly on the multiple sequence alignment used for the score calculation.