These GFF3 files and associated sequence and genome files are part of a
'Concise GFF3' set for the latest v10 genomes of Xenopus tropicalis and
Xenopus laevis.  

'Concise GFF3' is a simplified annotation version of the
Xenbase GFF3 files that are available at Xenbase. 

It contains only key required components for the hierarchy of gene annotation and associated gene_id/transcript_id for
tracking; other attributes from the Xenbase GFF3 files have been removed
for simplicity.

Currently, NCBI RefSeq and EnsEMBL are used as the two sources for the 'Concise GFF3'
sets.

More recent versions will continue to be updated on a quarterly basis or
when new versions are available from Amphibase.

For further information on how these files are created, contact Taejoon Kwon
at tkwon@unist.ac.kr