I am using nr.gz database downloaded from
ftp.ncbi.nlm.nih.gov/blast/db/FASTA/nr.gz. I am doing this after several years and I don't remember exactly if this is how this should be extracted. So here is what I have tried
formatdb -i nr.gz -o T -p T which doesn't seem to work anymore or gives me this error:
[formatdb] WARNING: Cannot add sequence number 1 (lcl|1_nr.gz) because it has zero-length..
I would really appreciate if someone could guide me through correct procedure.