GOtcha uses sequence similarity searches to associate GO terms with your sequence. These are ranked by probability and displayed graphically on a subtree of Gene Ontology.
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Martin,DMA, Berriman, M and Barton, GJ (2004),
GOtcha: a new method for prediction of protein function assessed by the annotation of seven genomes,
BMC Bioinformatics, 5:178 (18 November 2004)