“…The microfluorimetric-microelectrophoretic technique (KOHEN, KOHEN & JENKINS I966), the ascites tumor tissue culture cells (EL2 cells, cf. KOHEN 1964;KOHEN, SIEBERT & KOHEN 1964) and the X-ray produced EL2 giants (ELZG cells, cf. KOHEN, KOHEN & JENKINS 1966), the estimates relative to the amounts of substrates or metabolites introduced into the cytoplasm of single living cells (roughly 10-14 mole substrate/lO BPI cell volume) and the actual concentrations of reduced pyridine nucleotide reached in these cells have been described elsewhere (KOHEN, KOHEN & JENKINS 1966;KOHEN, KOHEN & THORELL 1968b & c).…”