Expression vectors
These are similar to the vectors described above but in addition
have the required signals located before and after the ‘foreign’ gene which
direct the host cell to translate the product of transcription into a protein.
It is sometimes a difficult, expensive or time-consuming procedure to analyse
for product from the ‘foreign’ gene and so, in addition to the selector genes
described above, there are frequently
There are many reasons which
are difficult to predict, why even a perfectly constructed gene may not be
functional, such as the consequence of the exact site of insertion in the
genome; hence the need for inbuilt controls.
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