. Cytology. Cytology. Figure 4-20. (a) Drawing Showing the Normal Banded Appearance of a Portion of a Salivary Chromosome (above) and Its Appearance After Formation of a Balbiani Ring (below) at the Point Marked by the Arrows, (b) Diagrammatic Representation of Part of a Helically Wound Bundle of Chromonemata in a Salivary Chromosome at the Location of a Fully De- veloped Balbiani Ring. Hypothetical loop formation of the ultimate chromo- nemata at the periphery is shown. (Fig. (a) from Gall, J. G., 1956. "On the Submicroscopic Structure of Chromosomes," Brookhaven Syinp. Biol., 21, F
. Cytology. Cytology. Figure 4-20. (a) Drawing Showing the Normal Banded Appearance of a Portion of a Salivary Chromosome (above) and Its Appearance After Formation of a Balbiani Ring (below) at the Point Marked by the Arrows, (b) Diagrammatic Representation of Part of a Helically Wound Bundle of Chromonemata in a Salivary Chromosome at the Location of a Fully De- veloped Balbiani Ring. Hypothetical loop formation of the ultimate chromo- nemata at the periphery is shown. (Fig. (a) from Gall, J. G., 1956. "On the Submicroscopic Structure of Chromosomes," Brookhaven Syinp. Biol., 21, Fig. 15, p. 29. Fig. (b) from Beermann, W., 1956. "Nuclear Differenti- ation and Functional Morphology of Chromosomes," Cold Spring Harbor Symposia Quant. Biol., 21, Fig. 6, p. 227; courtesy of Dr. Wolfgang Beer- mann, Zoologisches Institut, Universitat Marburg, Germany.) STRUCTURE AND FUNCTION OF THE NUCLEUS / 101. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wilson, G. B. (George Bernard), 1914-; Morrison, John H. (John Herbert), 1927-. New York, Reinhold
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