The extent of dye-coupling between exocrine acinar cells of the mouse pancreas. The dye-coupled acinar unit.

Sustained intra-acinar microiontophoretic injection of the fluorescent dye Lucifer Yellow CH in isolated fragments of mouse pancreas reveals a finite limit to the extent of intercellular communication between acinar cells. In two preparations for which complete sets of serial sections could be obtained the dye-coupled intercommunicating acinar units consisted of 110 and 230 individual exocrine acinar cells.