Abstract

EHRLICH ascites tumour cells from mice were suspended in Krebs phosphate Ringer in agar and maintained at 37° C. in a small chamber. Ling–Gerard micro-pipettes were filled with 3 M potassium chloride. They had a tip resistance of 30–50 megohms, and were checked for tip potentials by Adrian's method1. Any showing tip potentials greater than 2 mV. were discarded. Penetrations were observed microscopically under a magnification of 600.

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