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Pseudo-cleavage of the frogs egg



Pseudo-cleavage of the frogs egg



Trans Illinois State Acad Sci: 207-208



During a study on the fertilization of coelomic eggs of the frog Rana pipiens, it was found that these eggs exhibited a surface phenomenon which resembled normal cleavage and is termed pseudo-cleavage. Since literature produces no reference to this phenomenon, its appearance is described here. The eggs were obtained by the pituitary-ovulation method. A few hours after insemination, or exposure to sperm-free salt solns., the cytoplasm of the egg separated from the animal pole and became separated from the vitelline membrane which continued to maintain its original spherical shape. Pseudo-cleavage began as a constriction of the plasma membrane either at the center or at the periphery of the flattened cytoplasm. Cleavage furrows in most cases did not penetrate beyond the equator of the egg into the yolk material, yet the surface of the vegetal pole on some eggs was marked off with thin white lines which resembled cleavage planes. Pseudo-cleavage occurred in all of the exptl. solns. except the sperm-free NaCl giving rise to the conclusion that coelomic eggs upon the semination or exposure to salt solns. undergo surface changes which give the external appearance of cleavage.

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