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Cyclic AMP (cAMP) receptor protein, which acts as the sensor of cAMP levels in cells, is a well-studied transcription factor that is best known for allosteric changes effected by the binding of cAMP. Although genetic and biochemical data on the protein are available from several sources, structural information about the cAMP-free protein has been lacking. Therefore, the precise atomic events that...
We have studied the admittance of patch-clamped mast cells during exocytosis and found that they are adequately described by a four parameter equivalent circuit. On the basis of these measurements, we show that, contrary to current belief, when using a phase sensitive detector, small capacitance changes due to exocytosis or endocytosis should be studied by measuring current 90 degrees out of phase,...
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