Expression of resistin in muscle tissue. Expression of resistin in affected skeletal muscle tissue from patients with dermatomyositis (a) and myositis (b) in contrast with no expression in the muscle tissue of myasthenia gravis (c). Expression of resistin in regenerating muscle fibres (pointed with arrow) in a patient with dermatomyositis (d). Corresponding tissue sections stained with isotype antibodies (e). Resistin appears as brown. Nuclei were stained with hematoxylin. Original magnification, ×400 (a-c, e) and ×200 (d).