NCBI maintains a collection of unique taxonomy Ids and pairs these with associated genus and species designations. This function returns the set of pre-processed values that we use to check that something is a valid Taxonomy ID (or species name)
rankSeqlevels assigns a unique ID to each unique sequence name in the input vector. The returned IDs span 1:N where N is the number of unique sequence names in the input vector.
The seqlevelsStyle getter and setter can be used to get the current seqlevels style of an object and to rename its seqlevels according to a given style.
A Seqinfo object is a table-like object that contains basic information about a set of genomic sequences. The table has 1 row per sequence and 1 column per sequence attribute. Currently the only attributes are the length, circularity flag, and genome provenance (e.g. hg19) of the sequence, but more attributes might be added in the future as the need arises.