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Ultrastructure of muscles lacking keratin 18 (Krt18). Tibialis anterior (TA) muscles from wild-type (WT) FVB mice and FVB Krt18-knockout (KO) mice were processed for thin section electron microscopy (see materials and methods). Two Krt18-null (A) and two control (B) muscles were examined. No significant differences in 3 muscles from male mice were apparent in the contractile apparatus, lateral alignment of myofibrils, or membrane systems.
