bottom quark and the composite sector are needed for this modification, resulting in a large $m_b$ [^2]. As previously shown in Ref. [@Contino:2006qr], this problem can be solved by introducing two different composite operators to generate the top and bottom masses (see also [@Djouadi:2006rk; @Bouchart:2008vp]). Therefore, invoking the custodial symmetry, one can choose the SU(2)$_R$ charges of the composite operators generating the top mass to protect $Zb_L\bar b_L$ from the large top corrections and, simultaneously, choose the SU(2)$_R$ charges of the composite operators generating the bottom mass to solve $A^b_{FB}$ while preserving $R_b$.

Similar models in a slice of AdS$_5$ have been proposed in Ref. [@Djouadi:2006rk], with different embeddings for the composite fermions than in the present paper. These models can reproduce the measured $A^b_{FB}$ and $R_b$, but obtained a wrong spectrum for the quarks of the third generation. Another set of models solving the $A^b_{FB}$ anomaly in warped extra dimensions was presented in Ref. [@Bouchart:2008vp], the authors considered different fermionic embeddings than the ones considered in this work. Refs. [@Contino:2008hi] and [@Mrazek:2009yu] have studied the production and detection of the light fermionic partners of the top at the LHC in this class of models. Refs. [@Carena:2006bn], [@Carena:2007ua] and [@Pomarol:2008bh] 