The National Library of Medicine has released MeSH on Demand, a tool that can be used to find relevant MeSH (Medical Subject Headings) by inserting a section of text. On the MeSH on Demand web page, text such as a phrase, an abstract, or a grant summary can be entered, and the “Find MeSH Terms” button will retrieve appropriate MeSH terms. For example, upon entering the text: “Spontaneous activation of JNK-1 and PI-3 kinase can be induced in lupus-like chronic GVHD in the P->F1 model,” the following MeSH terms are retrieved: Mitogen-Activated Protein Kinases, and Phosphatidylinositol 3-Kinases. MeSH on Demand can be found at http://www.nlm.nih.gov/mesh/MeSHonDemand.html. .