as a result of exploration of the ultrastructure of 5 human rhabdomyosarcomas it was shown that , if present in the cytoplasm , cells of fibrillar bundles consisting of filaments of two types ( 40-60 a and 100-150 a ) and regular aggregations of z-like bands type present a reliable diagnostic sign of the myogenic origin of tumors .
C0007634
cells
C0010851
filaments