Cloning Vectors
Cosmid vectors are

cryptic plasmids
phages that lack cos site
plasmids that contain fragment of λ DNA including the cos site
plasmids that have no selection marker

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Cloning Vectors
Charon vectors are different from EMBL vectors because

physical separation of lambda arm from central fragment is required
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.

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