ELECTRON PROBE ANALYSIS OF THE CALCIUM DISTRIBUTION IN CELLS OF THE EMBRYONIC CHICK CHORIOALLANTOIC MEMBRANE II. Demonstration of intracellular location during active transcellular transport

摘要

Electron probe analysis of the embryonic chick chorioallantoic membrane reveals that calcium is located at discrete sites in the ectodermic cell layer of the membrane. The calcium loci are found at characteristic sites within distinctive "capillary covering" cells Evidence is presented that the calcium identified by electron probe analysis is that pool of calcium undergoing active transcellular transport. Mitochondria and/or endoplasmic reticulum do not appear to be responsible for the observed calcium sequestration.