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(a) Enlarged region of a longitudinal cryo-section of the A-band in human m. tibialis anterior showing the central M-band lines, the flanking bare regions (strong arrows) and the starts of the two bridge regions. Protein is white in this figure. (b) Density profile through the middle of the micrograph in (a) showing the prominent M-bridge densities. The main M-bridges are labelled as in (c). (Adapted from [20] with permission from Elsevier).
