  We present results for QCD with $N_f=2$ flavors of dynamical quarks using
nonperturbatively improved Wilson fermions at finite temperature on $16^3
\times 8$ and $24^3 \times 10$ lattices. We determine the transition
temperature in the range of quark masses $0.6 \lesssim m_\pi/m_\rho \leq 0.8$.
After fixing the Maximal Abelian gauge we investigate the contribution of
Abelian monopoles to the Polyakov loop, Polyakov loop susceptibility and
confirm Abelian and monopole dominance in full QCD.
