Cloning Vectors
Cosmids lack

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

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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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