  We investigate the production of positive parity baryon resonances in proton
electromagnetic scattering within the Sakai-Sugimoto model. The latter is a
string model for the non-perturbative regime of large $N_c$ QCD. Using
holographic techniques we calculate the generalized Dirac and Pauli form
factors that describe resonance production. We use these results to estimate
the contribution of resonance production to the proton structure functions.
Interestingly, we find an approximate Callan-Gross relation for the structure
functions in a regime of intermediate values of the Bjorken variable.
