Abstract
Pectoralis muscle from normal and dystrophic chickens was examined following preparation by the technique of freeze-fracturing. The intramembranous particle density of both the cytoplasmic and extracellular (luminal) faces of the junctional sarcoplasmic reticulum (SR), free SR, and T system of normal and dystrophic chickens was determined and subjected to statistical analysis. The density of intramembranous particles is not significantly different between the PF faces of the junctional SR and the free SR of normal pectoralis, or between the PF faces of the junctional SR and the free SR of dystrophic pectoralis. However, the particle densities of the PF fases of free and junctional SR of the dystrophic pectoralis are significantly lower than the particle density of the corresponding faces of normal SR. The particle densities on the EF faces of normal junctional SR and free SR are not significantly different nor are they different from the particle density of the EF face of dystrophic free SR. T system particle densities are such as to lead to a significantly lower overall particle density for the dystrophic. T system than for the normal.
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