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Journal of Dairy Science Vol. 62 No. 8 1322-1325
© 1979 by American Dairy Science Association ®
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Interaction of Sectory Vesicle Membrane Coat Structures with Membrane Free Areas of Forming Milk Lipid Globules

Werner W. Franke

Division of Experimental Pathology, German Cancer Research Center, D6900 Heidelberg, Federal Republic of Germany

T. W. Keenan

Mammary Biology Laboratory, Department of Animal Sciences, Purdue University, West Lafayette, IN 47907

ABSTRACT

Ultrastructure of regions of contact between casein micelle containing secretory vesicles and forming milk lipid droplets was examined. Close interactions of secretory vesicle with lipid droplet surface were common, and contact regions were characterized by formation of dense interphasic layers structurallysimilar to the dense coat of apical plasma membrane and milk fat globule membrane. Interphasic layers appeared to be comprised of regularly spaced, densely stained small subunits, similar to the situation in preexocytotic attachment plaques formed between secretory vesicles and apical plasma membrane in mammary secretory epithelial cells.






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Copyright © 1979 by the American Dairy Science Association ®.