The following may be of interest in regards to this question.
The Responses of Cells to
Electrical Fields: A Review
KENNETH R. ROBINSON
Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907
From Journal of Cell Biology 1985 Robinson 2023-7
"The significance of these recent results is increased by the
finding that several cell types that normally migrate or grow
long distances in embryos respond directionally to surprisingly small fields (Table I), and by the concurrent finding that developing embryos produce substantial endogenous currents. These two facts raise the possibility that endogenous electrical fields are involved in long-range signalling during embryonic development"