The NCBI RefSeq assembly ASM127255v1 was downloaded from NCBI on April 4th, 2016: wget ftp://ftp.ncbi.nih.gov/genomes/Dufourea_novaeangliae/CHR_Un/178035_ref_ASM127255v1_chrUn.fa.gz The NAL subsequently modified the deflines of this fasta file to only contain the RefSeq IDs, resulting in the file 178035_ref_ASM127255v1_chrUn_RefSeqIDs.fa.gz.