Perform elink to go from protein database to taxonomy database and write the resulting file of taxid and lineage to out_path
Arguments
- accessions
- A character vector containing the accession numbers to query in the protein database. 
- out_path
- A string specifying the path where the results of the query will be written. If set to NULL, a temporary directory will be used. 
- plan
- A character string that specifies the execution plan for parallel processing. The default is "multicore". 
Examples
if (FALSE) { # \dontrun{
accessions <- c("ABC123", "XYZ456", "LMN789")
proteinAcc2TaxID_old(accessions, out_path = "/path/to/output")
} # }