TY - RPRT TI - A method of determining spatial differences in cell surface permeability. AU - F K PARRISH AU - J W PARRISH PY - 1962 DO - 10.1016/0014-4827(62)90234-3 UR - https://pubmed.ncbi.nlm.nih.gov/14484056/ ID - 14484056 ER -