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Table 1 Comparison of slow muscle fiber characteristics

From: “Slow” skeletal muscles across vertebrate species

  “Tonic” fiber in frog Slow fiber in (zebra) fish Mammalian AP-less fiber Mammalian type I fiber
Innervation En grappe/myoseptal Myoseptal Multiple innervation En-plaque
Action potential (−) (−) (−) (+)
Synaptic current kinetics Slow Slow NA Slow?
AChR subunits NA αβδ NA NA