Cloning Vectors
Plasmids which are maintained as limited number of copies per cell are known as

stringent plasmids
cryptic plasmids
relaxed plasmids
all of these

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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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