NCBI has released three new Entrez databases that link small organic molecules to bioactivity assays, PubMed abstracts, and protein sequences and structures. They are PubChem Substance, PubChem Compound, and PubChem Bioassay. PubChem Substance contains over 800,000 chemical samples. PubChem Bioassay allows one to search for bioactivity. For instance, the query „leukemia AND lc50[tid description]“ in PubChem Bioassay retrieves eight growth inhibition assays with measured LC50 values in various leukemia cell lines. [via Open Access News] Auch zugänglich via PubMed’s Suchpulldownmenü.