Definition: A recombinantly engineered plasmid, a circular DNA containing, in order: a plasmid origin of replication and a drug-resistance marker, the cos (cohesive end) site from bacteriophage ?, and a fragment of eukaryotic DNA to be cloned; cosmids are constructed to permit cloning of fragments of up to about 40,000 base pairs in length, with one or more unique restriction sites being necessary to facilitate cloning.
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Examples: glitazone, GI cocktail, etc.