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Field dependence of the spin-lattice relaxation rate, R1, for short-chain phosphatidylcholines in the absence and presence of PI-PLC enzymes. Data covering the field range 0.06 to 11.7 T is shown in (A) for rPI-PLC (●) and Y246S/Y247S/Y248S (□) in the presence of 3 mm diC7PC and in B for 3 mm diC7PC (○) and 25 mm diC6PC (X). C shows at fields below 0.05 T. The lines drawn through the each data set represent best fits to equations discussed in Refs. 16 and 17).
