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Fig. 11. Transmission electron micrograph of depressor mandibulae sarcomeres at
resting (= optimal) length. The sarcomeres are short (
1.5 µm) compared
to those of typical vertebrate skeletal muscles. The A-band (double-headed
arrow) is also proportionately shorter (
1.0 µm) so that the relative
overlap of thick and thin filaments is similar to that of a typical vertebrate
skeletal muscle at L0. Scale bar, 1 µm.