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Journal of Neuroscience, Vol 7, 1215-1222, Copyright © 1987 by Society for Neuroscience
Visualization of neuromuscular junctions over periods of several months in living mice
JW Lichtman, L Magrassi and D Purves
Identified neuromuscular junctions were followed in the sternomastoid
muscle of living mice for several months by repeated staining with the
fluorescent dye 4-(4-diethylaminostyryl)-N-methylpyridinium iodide (4-
Di-2-ASP; Magrassi et al., 1987). Overall terminal growth occurred at many
endplates; however, the branching pattern of presynaptic arbors was largely
unchanged, even after several months. The absence of significant remodeling
over time was not a result of dye-staining, since sprouting was readily
induced at residual motor endings by partial denervation. We conclude
that--apart from overall growth--most neuromuscular junctions in the adult
mouse are stable over intervals that represent a significant fraction of
the animal's lifetime.
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