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Fig. 2. Transmission electron micrographs of longitudinal sections of the
transverse muscle fibres of the tentacle (A) and arm (B) of Loligo
pealei. The extensive sarcoplasmic reticulum (SR) of the cross-striated
tentacle fibres is visible. Note the short sarcomeres and short thick
filaments of the tentacle fibres compared with the much longer thick filaments
apparent in the obliquely striated arm fibres. Scale bar, 1 µm.
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