Titlebook: Atlas of Xenopus Development; G. Bernardini,M. Prati,G. Scarì Book 1999 Springer-Verlag Italia 1999 Vertebrate.Xenopus, Embryologie.Xenopu

mastopexy

Fundamentals of Renal Pathologyes. Cystic spermatogenesis, on the other hand, occurs in anamniotes that often require many spermatozoa for external fertilization. In the cystic testis of ., spermiogenesis is active throughout the year and occurs in continuous waves of differentiating cells (Figs. 1,2).

cancellous-bone

CRUMB

Thin Basement Membranes and Alport Syndromeir apices, mostly in the animal-vegetal direction, forming a groove (which will become the blastopore) and pulling the epithelium of the marginal zone toward the sub-blastoporal endoderm. The bottle cells sink into the embryo, followed by the involuting marginal zone. The area of involution is called the blastopore lip (Fig. 14).

沙發(fā)

https://doi.org/10.1007/978-0-387-31127-2When South America and Africa separated some 90 million years ago, the Pipidae, a family of the order of Anura, diversified independently in the two continents. Four genera are now extant: . living in South America, . and . restricted to tropical West Africa, and . widespread in sub-Saharan Africa.

instructive

Thin Basement Membranes and Alport SyndromeHaving reached the external surface of the egg coats, the activated spermatozoa still have a long way to go to deliver their DNA content to the eggs; they have to pass through the different layers of the jelly first, penetrate the vitelline envelope, and then, finally, fuse with the egg.

向下

Thin Basement Membranes and Alport SyndromeBy the end of gastrulation, the embryo has taken on an ovoid shape elongated in the antero posterior axis (Fig. 18).

憤憤不平

CRAMP

pantomime

Physical Properties of Reservoir Rocks,Five-day-old tadpoles (stage 47) are approxi-mately 12 mm long. All sense organs are now well differentiated. External gills have regressed and the internal ones are protected by an oper?culum. The cement gland, now unpigmented, is in regression (Fig. 40).

浮雕