s.\ Lanceolate endings double labelled with anti-synaptophysin (SYN, green channel) and anti-ASIC0 (red channel) antibodies (A--C) and with anti-S000 (green channel) and anti-ASIC0 (red channel) antibodies (D--F). In each case the green (A, D) and red (B, E) channels are shown separately, as well as merged (C, F). 