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Updated: Mar 30, 2026

Author Spotlight: Isolation of Long Muscle Fibers from Mouse Hindlimb Muscles for Studying Excitation-Contraction Coupling Across Fiber Types
Published on: December 1, 2023
"Slow" skeletal muscles across vertebrate species
Victor M Luna1, Eriko Daikoku2, Fumihito Ono2,3
1Division of Integrative Neuroscience, Department of Psychiatry, New York State Psychiatric Institute, Columbia University, New York, NY 10032 USA.
Abstract:
Skeletal muscle fibers are generally classified into two groups: slow (type I) and fast (type II). Fibers in each group are uniquely designed for specific locomotory needs based on their intrinsic cellular properties and the types of motor neurons that innervate them. In this review, we will focus on the current concept of slow muscle fibers which, unlike the originally proposed version based purely on amphibian muscles, varies widely depending on the animal model system studied. We will discuss recent findings from zebrafish neuromuscular junction synapses that may provide the framework for establishing a more unified view of slow muscles across mammalian and non-mammalian species.
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