Cloning Vectors
Charon vectors are different from EMBL vectors because

both (a) and (b)
physical separation of lambda arm from central fragment is required
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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Cloning Vectors
Cosmid vectors are

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

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