highly significantP < 0.0001
The maximum cross-sectional areas for those presynaptic to the NK1r cells varied from 0.16–4.38 μm 2 (median 1.44 μm 2 , n = 309), while the corresponding values for those presynaptic to the PKCγ cells ranged from 0.17–2.71 μm 2 (median 0.61 μm 2 , n = 280), and this difference was highly significant ( P < 0.0001, Mann–Whitney U -test).