GenomeDescription-class
                        GenomeDescription objects
NCBI-utils              Utility functions to access NCBI resources
Seqinfo-class           Seqinfo objects
getChromInfoFromEnsembl
                        Get chromosome information for an Ensembl
                        species
getChromInfoFromNCBI    Get chromosome information for an NCBI assembly
getChromInfoFromUCSC    Get chromosome information for a UCSC genome
loadTaxonomyDb          Return a data.frame that lists the known
                        taxonomy IDs and their corresponding organisms.
mapGenomeBuilds         Mapping between UCSC and Ensembl Genome Builds
rankSeqlevels           Assign sequence IDs to sequence names
seqinfo                 Accessing/modifying sequence information
seqlevels-wrappers      Convenience wrappers to the seqlevels() getter
                        and setter
seqlevelsStyle          Conveniently rename the seqlevels of an object
                        according to a given style