highly significantP < 0.0001
There was a clear difference in the soma areas of the NK1r cells that were retrogradely labelled with CTb (range, 116-1084 μm 2 ; median, 228 μm 2 ) and those that were not (range, 52-625 μm 2 ; median, 101 μm 2 ), and this was highly significant ( P < 0.0001; Mann–Whitney U test).