The files in subdirectory ncbi_split_by_type were generated to supply individual tracks in the JBrowse/Web Apollo applocation. Briefly, the original gff3 file ref_gapfilled_joined_lt9474.gt500.covgt10_scaffolds.gff3 was split 1) by gene_biotype attribute, or, if the feature was not a gene and did not have a Parent attribute, by the 'type' field. Genes with the 'protein_coding' gene_biotype attribute were further split into low-quality protein-coding and regular protein-coding, and transcripts with a 'protein_coding' gene_biotype attribute in the parent gene feature were further split out into misc_RNA.