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I-band titin domain architecture showing the splice variant likely to be found in psoas muscle (1, 13). The epitope positions of the two antibody types used in this study, N2-A and I20/I22, are indicated. Note that not the entire I-band titin is elastic; a 100 nm-long segment at the Z-disc end is functionally stiff. Ig, Ig-like; FN3, fibronectin type-3-like.
