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Fig. 1. Arrangement of the SR components along the half sarcomere in SBM fibres. (A) Conventional electron micrograph of the fibre longitudinal section, showing the regular striation pattern (I, I band; Z, Z line; A, A band; H, H zone; M, M line) and regular arrangement of the SR components. LT, longitudinal tubules; FC, fenestrated collars; TC, terminal cisternae; T, transverse tubule. Bar, 2 µm. (B) Diagram illustrating the arrangement of the SR components and the five consecutive regions along the half sarcomere.