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- W2066651623 abstract "Miniature end-plate potential (MEPP) and end-plate potential (EPP) amplitude histograms were examined in the mouse diaphragm during degeneration, deterioration, re-innervation and neonatal development. MEPPs and EPPs were recorded with conventional electrophysiological techniques. Control MEPP amplitude distributions from mice 21–30 days old showed two classes of MEPPs. The larger class composed 80–90% of the MEPPs and formed a bell-shaped distribution (bell-MEPPs). The smaller class (skew-MEPPs) formed a skewed distribution with a peak 17to115 that of bell-MEPPs. Usually, MEPP amplitude distributions did not change during the course of nerve degeneration or during deterioration in the bath. MEPP amplitude distributions from newly re-innervated fibers were composed mainly of skew-MEPPs. At later stages of re-innervation the relative numbers of skew-MEPPs decreased. Many fibers from neonatal mice (2–3 days old) also showed mainly skew-MEPPs. Rise time vs amplitude plots were constructed from neonatal and re-innervating preparations. The skew-MEPP time-to-peak measurements fell on or below the regression line calculated from the time-to-peak data of the bell-MEPPs. This indicates that the skew-MEPPs originated from the same site as the bell-MEPPs. Unitary EPPs were recorded from neonatal and re-innervating preparations by reducing the evoked response with cobalt ions (4 mM). Distributions of unitary EPPs were similar to those of bell-MEPPs. It is concluded that there are two classes of spontaneous quanta. The skew-MEPP class dominates MEPP amplitude distributions during the early stages of re-innervation and early neonatal preparations. In all stages of development the unitary evoked EPPs have the same mean amplitude and time-to-peak as the bell-MEPPs. The data suggest that the skew class is not available for evoked release." @default.
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- W2066651623 date "1982-10-01" @default.
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- W2066651623 title "Changes in MEPP and EPP amplitude distributions in the mouse diaphragm during synapse formation and degeneration" @default.
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- W2066651623 doi "https://doi.org/10.1016/0165-3806(82)90151-1" @default.
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