Summary of IHC analysis when subdivided based on side. The number in the table represents the number of sections analyzed that showed a measurable difference in normalized stain intensity for one side or the other. The results are further divided into measures within the first 50 μm and the first 20 μm. These correspond to the distance related to unit recordings and approximately the first 3–4 cell layers, respectively. There does not appear to be any particular bias in the results to one side or the other and that surface roughness is not significantly contributing to the response.