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Fig. 1. Transmission electron micrographs of longitudinal sections of muscle fibres
from the transverse muscle mass of the tentacle (A) and arm (B) of Loligo
pealei. Note the short sarcomeres and short thick filaments of the
tentacle fibres compared with the longer thick filaments of the obliquely
striated arm fibres. SR, sarcoplasmic reticulum. Scale bar, 1 µm. From Kier
and Curtin (Kier and Curtin,
2002).