"Annotated genes" refers to genes that have been studied and described in detail. These genes have been identified, categorized, and their functions have been documented. Full definition
Ensembl also integrates manually annotated gene structures from external sources where available. (sanger.ac.uk)
«Riding» different lines in the DNA Subway, users can predict and annotate genes in up to 100,000 base pairs of DNA (Red Line), and prospect entire plant genomes for specific genes (Yellow Line). (dnalc.org)
Vega displays only manually annotated gene structures built using transcriptional evidence, which can be examined in the browser. (sanger.ac.uk)