 The Chem Query option allows users to draw (using MarvinSketch applet or a ChemSketch applet) or to type (SMILES string) a chemical compound and to search the YMDB for chemicals similar or identical to the query compound.The Advanced Search option supports a more sophisticated text search of the text portion of YMDB.The Sequence Search button allows users to conduct BLAST (protein) sequence searches of all sequences contained in YMDB.