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Identify D. melanogaster ortholog FlyBase blastp search of predicted protein against the D. melanogaster “Annotated Proteins” database Consult instructor Potential novel gene Yes Has at least one significant match (E-value < 1e-5)? No NCBI blastp search of predicted protein against the nr protein database Probable misprediction No Has at least one significant match (E-value < 1e-5)? Yes Matches multiple D. melanogaster genes? No Assign the only D. melanogaster match as the putative ortholog Yes Multiple matches with E-values similar to the best match? No Assign gene with the lowest E-value as the putative ortholog Yes Multiple matches with sequence identity similar to the best match? No Assign gene with the highest sequence identity as the putative ortholog Yes Multiple matches with alignment coverage similar to the best match? No Assign gene with the highest alignment coverage as the putative ortholog Yes Multiple matches located on the same Muller element as the best match? No Assign D. melanogaster gene located on the same Muller element as the contig in the target species as the putative ortholog Yes Multiple genes within the orthologous region in D. melanogaster (as defined by the placements of the adjacent genes) No Assign putative ortholog based on synteny with D. melanogaster Yes Consult instructor