it was concluded that 1 ) there was an additional tpp+ binding as cellular [ tpp ] rose in response to more negative membrane potentials , 2 ) the transport system for l-arginine in these cells ( system y+ ) operates as a facilitated diffusion system driven by the membrane potential , and 3 ) in some circumstances , l-arginine could be employed as a probe of em .
C0007634
cells
C2244328
facilitated diffusion