Preabsorption with immunogen peptide eliminated labelling in the ganglion and in the muscle indicating that the obtained labelling is specific.

Photomicrographs of masseter muscle spindles showing positive, preabsorption and negative controls for three markers used in the study. Large arrows indicate the location of the spindle, small arrows point to small-calibre intrafusal nerve fibres. B1 and C1 were taken with a 60× objective, all others with a 40×. All scale bars = 25 µm.