Segmented Bioseq

A Seg set contains a segmented Bioseq and a Parts Bioseq-set, which in turn contains the raw Bioseqs that are referenced by the segmented Bioseq. This may constitute the nucleotide component of a Nuc-prot set. 

An Equiv Bioseq-set is used in the Entrez Genomes division to hold multiple equivalent Bioseqs. Eor example, human chromosomes have one or more genetic maps, physical maps derived by different methods and a segmented Bioseq on which islands of sequenced regions are placed. An aligiunent between the various Bioseqs is made based on references to any available common markers. 

However, the Bioseq isn t necessarily a fully sequenced molecule. It may be a segmented sequence in which, for example, the exons have been sequenced but not all of the intronic sequences have been determined. It could also be a genetic or physical map, where only a few landmarks have been positioned. 

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