the size of miniature end-plate potentials ( m.e.p.p.s ) and miniature end-plate currents ( m.e.p.c.s ) at frog neuromuscular junctions was increased by a factor of two or more following treatment with norepinephrine , epinephrine , a camp derivative , insulin or acth .
C0028351
norepinephrine
C0014563
epinephrine