The Nucleon's Mirror Image: Revealing the Strange and Unexpected
  A remarkably successful program of parity-violating electron scattering experiments is providing new insight into the structure of the nucleon. Measurement of the vector form factors enables a definitive study of potential strange quark-antiquark contributions to the electromagnetic structure such as the magnetic moment and charge distribution. Recent experimental results have already indicated that effects of strangeness are much smaller than theoretically expected. In addition, the neutral axial form factor appears to display substantial corrections as one might expect from an anapole effect. 
R.D. McKeown and M.J. Ramsey-Musolf (Kellogg Radiation Lab, Caltech)