Which GTF and Fasta version to use

File Content Regions Description
GTF Comprehensive gene annotation CHR It contains the comprehensive gene annotation on the reference chromosomes only
Fasta Genome sequence, primary assembly (GRCm39) PRI Nucleotide sequence of the GRCm39 primary genome assembly (chromosomes and scaffolds)
The sequence region names are the same as in the GTF/GFF3 files

Reference: https://github.com/alexdobin/STAR/issues/421#issue-324114662