Actin is a Constituent of the Nuclear Matrix and Chromosome Scaffold in Physarum poly cephalum IMMUNO CYTOCHEMICAL LOCALIZATION OF ACTIN IN NUCLEAR MATRIX AND CHROMOSOME SCAFFOLD OF BARLEY Distribution of NuMA-like Proteins and Its Changes During Cell cycle in Plant Cells THE SPATIAL ARRANGEMENT OF CHROMOSOMES IN SOMATIC CELLS OF EUCARYOTE Ultrastructural Observations on Nuclear Matrix in the Pollen Mother Cells of Lily