  Inspired by the recent findings of the two $P_c^+$ states in the $J/\psi p$
mass spectrum at LHCb, we investigate the elastic and inelastic cross sections
of the $J/\psi N$, $\eta_c N$, $\Upsilon N$ and $\eta_b N$ channels within the
constraints from heavy quark spin and flavour symmetry. The $\bar{D}^{(*)}
\Sigma_c^{(*)}$ ($B^{(*)} \Sigma_b^{(*)}$) bound states predicted in earlier
works should be accessible in elastic and/or inelastic processes of the $J/\psi
N$ and/or $\eta_c N$ ($\Upsilon N$ and/or $\eta_b N$) interactions.
