Sxxnwei

Thanks for the prompt reply. What is the format of NCBI files? The ftp links, such as ftp://ftp.ncbi.nlm.nih.gov/pub/taxonomy/accession2taxid/prot.accession2taxid.FULL.gz ftp://ftp.ncbi.nlm.nih.gov/pub/taxonomy/taxdmp.zip I cannot open. thanks, Sean

I only can download the files via wget, and successfully got the NCBI tax ID in the output based on database made from the RefSeq non-redundant proteins. thanks again! Sean