As known, electron vacuum polarization by nuclear Coulomb field produces Uehling potential with the range $\hbar/2m_e c$. Similarly, neutrino $Z$ boson long $\sim G^2/r^5$ large $\hbar/2m_{\nu}c$. Attempts to measure parity-conserving part of this produced only limits on which are several orders magnitude higher than standard model predictions. We show that parity non-conserving (PNC) exchange ...