- Coordinates are one-based, fully closed (i.e. position start at 1 and an interval's end position is included).
- (for files released by GENCODE & Ensembl) CDS include start_codon but not stop_codon. stop_codon is included in the UTR instead.
- Coordinates are zero-based, half open (i.e. position start at 0 and an interval's end position is not included).
- (for refFlat.txt.gz file available via UCSC) CDS does include start and stop codons