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Abstract
Fluorescent procion dyes when iontophoresed into lens fibers through a glass capillary microelectrode appear, on gross observation, to be within a single fiber only. Fluorescent microscopy reveals, however, that the dye diffuses appreciably from one cell to another. The movement is primarily along a single column of fibers at low currents, but spreads to adjacent columns at higher currents. The dye does not enter the fibers from the extracellular space. Fibers adjacent to the electrode track seem able to exclude the dye. It is concluded that movement of dye from one fiber to another must occur across low resistance "tight junctions."