Cloning Vectors
Phagemid consist of

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

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Cloning Vectors
Cosmids lack

cleavage site for the insertion of foreign DNA
origin of replication
marker genes coding for replication
genes coding for viral proteins

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Cloning Vectors
Charon vectors are different from EMBL vectors because

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

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