Cloning Vectors
Cosmids lack

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

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Cloning Vectors
Phagemid consist of

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

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