FOS and amyotrophic lateral sclerosis: The vast majority of projection neurons, including all of those in the SDH, the LSN, the medial part of the deep dorsal horn and the area around the central canal lacked mCherry, while a very small proportion of those in lateral lamina V (four cells in each animal, corresponding to between 5 and 7% of ALS cells in this region) were mCherry-labelled, and these were also Fos-positive.