?:definition
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A structural unit composed of a nucleic acid molecule which controls its own replication through the interaction of specific proteins at one or more origins of replication. [Sequence Ontology: SO:0000340 (SOWiki) http://www.sequenceontology.org/browser/current_svn/term/SO:0000340] EXAMPLE(S): Most humans have 23 pairs of chromosomes--22 pairs of numbered chromosomes, called autosomes, and one pair of sex chromosomes, X and Y. OTHER NAME(S): NOTE(S): This class can represent eukaryotic (e.g. human), mitochondrial, bacterial, and viral chromosomes, for example.
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