Sarcoplasmic Reticulum of Striated Muscle: Localization of Potential Calcium Binding Sites

Science  24 Feb 1967:
Vol. 155, Issue 3765, pp. 1019-1021
DOI: 10.1126/science.155.3765.1019


Fish branchial muscle stained at a low pH with thorium dioxide shows localization of the stain over the sacroplasmic reticulum. Binding of the positively charged thorium micelles with dissociated acid groups of polyanions in this region suggests a possible mechanism for the storage and release of divalent cations such as calcium.