  Elliptic flow ($v_{2}$) values for identified particles at mid-rapidity in
Au+Au collisions, measured by the STAR experiment in the Beam Energy Scan at
RHIC at $\sqrt{s_{NN}}=$ 7.7--62.4 GeV, are presented. A beam-energy dependent
difference of the values of $v_{2}$ between particles and corresponding
anti-particles was observed. The difference increases with decreasing beam
energy and is larger for baryons compared to mesons. This implies that, at
lower energies, particles and anti-particles are not consistent with the
universal number-of-constituent-quark (NCQ) scaling of $v_{2}$ that was
observed at $\sqrt{s_{NN}}=$ 200 GeV.
