SGD_features.tab The latest version of the SGD_features.tab file is based on Genome Version R64-2-1. The SGD_features.tab file is updated weekly (Saturday). NOTE: On 4 September 2004, the SGD_features.tab file replaced the previously used chromosomal_feature.tab file. File contents: 1. Information on current chromosomal features in SGD, including Dubious ORFs. Also contains coordinates of intron, exons, and other subfeatures that are located within a chromosomal feature. 2. The relationship between subfeatures and the feature in which they are located is identified by the feature name in column #7 (parent feature). For example, the parent feature of the intron found in ACT1/YFL039C will be YFL039C. The parent feature of YFL039C is chromosome 6. 3. The coordinates of all features are in chromosomal coordinates. Columns within SGD_features.tab: 1. Primary SGDID (mandatory) 2. Feature type (mandatory) 3. Feature qualifier (optional) 4. Feature name (optional) 5. Standard gene name (optional) 6. Alias (optional, multiples separated by |) 7. Parent feature name (optional) 8. Secondary SGDID (optional, multiples separated by |) 9. Chromosome (optional) 10. Start_coordinate (optional) 11. Stop_coordinate (optional) 12. Strand (optional) 13. Genetic position (optional) 14. Coordinate version (optional) 15. Sequence version (optional) 16. Description (optional) Note that "chromosome 17" is the mitochondrial chromosome. The SGD_features.tab file is complemented by GFF3 file saccharomyces_cerevisiae.gff