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181.
Summary The anisotropic band of skeletal muscle is a complex structural assembly of the protein myosin and associated nonmyosin components. To study the relationships among these proteins, aggregates of thick myofilaments held together at the M line (A segments) have been prepared from fresh and glycerol extracted chicken pectoralis and rabbit psoas muscles and from fresh frog sartorius muscle. The structure of the A segments included several thick filaments, an M line, and a bare zone or pseudo-H zone, lateral to the M line. Most of the A segments exhibited a pattern of eleven periodic stripes in each half lateral to the bare zone. The A segments from fresh muscle displayed these stripes more consistently than did the A segments from glycerinated muscle. Some of the major stripes appeared to be double, and there were two subdivisions between the stripes nearest the bare zone. The more lateral of the major A band stripes, however, had one subdivision between them. The M line consisted of three prominent medial stripes and two fainter lateral stripes. In the M lines of rabbit A segments the lateral stripes were located well into the bare zone whereas the lateral stripes of M lines in chicken A segments were closer to the three medial M line stripes. Our results on the preparation and properties of A segments are compared with those of other investigators.This research was supported in part by General Research Support (RR-5576) from the United States Public Health Service to the College of Medicine and Dentistry of New Jersey, Rutgers Medical School. Paper I in this series is Irish and Wilson (1979a) 相似文献