  In this paper we work out the RTT-realization for the Yangian algebra of the
Hubbard model and AdS/CFT correspondence. We find that this Yangian algebra is
of a non-standard type in which the levels of the Yangian mix. The crucial
feature that allows this is a braiding factor that deforms the coproduct and
generates the central extensions of the underlying sl(2|2) Lie algebra. In our
RTT-realization we have also been able to incorporate the so-called secret
symmetry and we were able to extend it to higher Yangian levels. Finally, we
discuss the center of the Yangian and the automorphisms related to crossing
symmetry.
