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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