  We will study the AdS/CFT correspondence in an intermediate region between
the strong form of this correspondence (string theory on AdS being dual to a
boundary CFT), and the weak form of this correspondence (supergravity on AdS
being dual to a boundary CFT). We will go beyond the supergravity approximation
in the AdS by using the fact that strings have an extended structure. We will
also calculate the CFT dual to such string corrections in the bulk, and
demonstrate that they are consistent with the strong form of the AdS/CFT
correspondence. So, even though the conformal dimensions of both the relevant
and the irrelevant operators will receive string corrections, the conformal
dimension of marginal operators will not receive any such corrections.
