are linear in $N_c$. The ratio $R=g_A/\mu_{an}$ is therefore independent of $N_c$ in the ’t Hooft and large $N_c$ limit. The instanton calculation [@HRYY-PRL] is found to give $
 g_A\approx 0.69\frac{N_c}{3} +{\cal O}(N_c^0)$ and $\mu_{an}\approx 2.16\frac{m_N}{M_{KK}}\frac{N_C}{3}+{\cal
O}(N_c^0)$. With the ${\cal O}(1)$ term ignored for the moment, the predicted ratio for $M_{KK}\approx m_N$ as required in the meson sector [@SS] comes out to be $R\approx 0.32$. The experimental values are $g_A=1.26$ and $\mu_{an}=3.7$, so the empirical ratio $R=0.34$ gives a support to the prediction.

One can go one step further and estimate the ${\cal O}(1)$ correction with no sweat. In fact, one can argue that $1/N_c$ corrections from non-planar loop contributions come only at ${\cal
O}(1/N_c)$ and higher. The ${\cal O}(1)$ corrections are common in both $g_A$ and $\mu_{an}$ and they arise in a simple book-keeping of the spin-flavor operators involved in the hedgehog configuration that is totally independent of dynamics. The leading correction is given simply by the replacement $N_c\rightarrow N_c+2$. Thus the final prediction for $N_c=3$ is $g_A \approx 1.15$ and $\mu_{an}\approx 3.6$ in close agreement with the experimental values [^4]

Another remarkable prediction of the instanton baryon description [@HRYY-long] is that the nucleon EM form factors are completely 