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Neuromuscular junctions in fast-twitch muscle fibres

A confocal micrograph of living nerve terminals on rat skeletal muscle fibre. It shows mature (18 weeks after birth) neuromuscular junctions on extensor digitorum longus (EDL, fast -twitch and non-postural) rat muscle fibres. Fluorescently labelled alpha-bungarotoxin, a snake toxin, has been used to visualise the regions of highly concentrated receptor proteins on the musce fibre surface. These al…