  We study four-dimensional N=1 Spin(10) gauge theory with a single spinor and
vectors at the superconformal fixed point via the electric-magnetic duality and
a-maximization. When gauge invariant chiral primary operators hit the unitarity
bounds, we find that the theory with no superpotential is identical to the one
with some superpotential at the infrared fixed point. The auxiliary field
method in the electric theory offers a satisfying description of the infrared
fixed point, which is consistent with the better picture in the magnetic
theory. In particular, it gives a clear description of the emergence of new
massless degrees of freedom in the electric theory.
