  A possible deviation from the precession of the Gravity Probe-B gyroscope
predicted by general relativity is obtained in the nonsymmetric gravity theory.
The time delay of radio signals emitted by spacecraft at planetary distances
from the Sun, in nonsymmetric gravity theory is the same as in general
relativity. A correction to the precession of the gyroscope would provide a
possible experimental signature for the Gravity Probe-B gyroscope experiment.
The Lense-Thirring frame-dragging effect is predicted to be the same as in GR.
