FILE DESCRIPTION: GFF3

 # A "tabulation separator" in text or data files refers to using the tab character (\t) to separate different fields or properties within a line or row of data.
propertie1\t.\tpropertie2\t. ...

gene_ID .   strand  .   type    .   position    .   chr-exon-start  .   chr-exon-end    .   chr-gene-start  .   chr-gene-end
ENSCUSG00005000443  .   +   .   exon    .   1   .   159950  .   160160  .   159950  .   166123

PROPERTIES

• gene_ID : the gene identifier
• strand : + (forward strand) or - (reverse strand)
• type : always exon
• chr-exon-start : The "chromosomal start position of exon" refers to the specific location on a chromosome where an exon (a coding region of a gene) begins maximum inclusive wise exon-segment that compose a cds)
• chr-exon-end : The "chromosomal end position of exon" refers to the specific location on a chromosome where an exon (a coding region of a gene) ends
• chr-gene-start : The "chromosomal start position of gene" refers to the specific location on a chromosome where a gene begins
• chr-gene-end : The "chromosomal end position of gene" refers to the specific location on a chromosome where a gene ends

The "maximum inclusive exon-segment that composes a CDS" refers to the longest contiguous sequence of exons that together form a complete coding sequence (CDS) for a gene. This segment includes all exons that are transcribed and translated into a functional protein product.