  In the $SU(3)_C \times SU(2)_L \times SU(2)_R \times U(1)_{(B-L)/2}$
extension of the standard model, a minimal (but asymmetric) scalar sector
consists of one $SU(2)_R \times U(1)_{(B-L)/2}$ doublet and one $SU(2)_L \times
SU(2)_R$ bidoublet.
  Previous and recent studies have shown that this choice is useful for
understanding neutrino mass as well as dark matter. The constraints from flavor
changing neutral currents mediated by the scalar sector are discussed in the
context of the latest experimental data.
