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Fig. 1. (A,B) Nomarski Differential Interference Contrast (DIC) images of larval
zebrafish outer, red (A) and inner, white (B) muscle fibres. The outer, red
fibres constitute a single, superficial cell layer and run parallel to the
notochord, while the inner, white fibres are several cell layers thick and run
obliquely to the notochord and midline. (C,D) Individual red (C) and white (D)
muscle fibres from 5 d.p.f. larvae filled with Lucifer Yellow (0.1%) in the
presence of 1-heptanol (2 mmol l1). Arrows point to the
edges of the muscle fibres. Scale bars, 50 µm.