Cloning Vectors
Phagemid consist of

plasmid vector carrying origin of replication of plasmid only
plasmid vector carrying origin of replication of λ phage only
plasmid vector carrying λ phage's cos site
plasmid vector carrying λ attachment (λ att) site

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Cloning Vectors
Charon vectors are different from EMBL vectors because

both (a) and (b)
they have more extensive range of restriction targets with in their polylinkers.
physical separation of lambda arm from central fragment is not required
physical separation of lambda arm from central fragment is required

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