Sequence Alerting System@ Heidelberg - performs daily comparisons to new entries in the protein and nucleic acid databanks. SwissShop@ ExPASY - performs weekly comparisons to new and updated entries in the SwissProt protein databank. XREFdb@ NCBI - performs monthly comparisons to dbEST and reports which ESTs have been mapped. AutoBlast@ Sanger Center - performs weekly comparisons to data accumulating from the C.elegans genomic sequencing project.