Szukana fraza: [Abstrakt = "A 29\-year\-old patinet with suspected neurogenic atrophy was examined. A biopsy of quadriceps sinister was perfomed. Electronmicroscopy analysis revealed presence of muscule fibers of the correct diameter, preserved sarcomere structure and typical, located sub\-membranously nuclei. Except fibers of the correct diameter and ultrastructure, fibers showing features of immaturity, much smaller than normal diameter and with singular nuclei were observed."]