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First published online December 28, 2007
Journal of Experimental Biology 211, 164-169 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.008144
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Muscle specialization in the squid motor system

William M. Kier1,* and Frederick H. Schachat2

1 University of North Carolina, Chapel Hill, NC 27599, USA
2 Duke University Medical Center, Durham, NC 27710, USA


Figure 1
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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, 2002Go).

 

Figure 2
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  		Fig. 2. Photograph of polyacrylamide gel (10% acrylamide) showing the relative abundance of myosin A (204 nucleotides, nt) and myosin B (189 nt) mRNAs following RT-PCR of RNA from muscle fibres of the transverse muscle mass of the arm (middle lane) and the tentacle (right lane). The 1 kb ladder (left lane) confirms the size of the products.

 

Figure 3
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  		Fig. 3. Schematic diagram of a portion of an obliquely striated muscle fibre showing the unsymmetrical interaction of the cross-bridges with thin filaments due to the stagger of myofilaments. The thin filaments are black, the thick filaments (including two with myosin cross-bridges) are blue and the Z-elements are red.

 




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