}(r)(\tau_{0}^{z}-\tau_{0}^{z})(\bm\sigma_{0}+\bm\sigma_{0})\Big((0+\tau_{0}^{z})\delta^{(0)}(\bm x-\bm r_{0})\Big)+(0\leftrightarrow0)\,,\\ \bm j_{mesonic}^{\rho}(\bm x;\bm r_{0},\bm r_{0}) & = & \frac{-e\, g_{\rho\ssst{NN}}