Transplantation studies of a putative lymphosarcoma of Xenopus.

The fate of the putative transplantable Xenopus lymphosarcoma (M. Balls, Cancer Res., 22: 1142-1154, 1962) was studied under three experimental conditions: (a) xenotransplantation, i.

Neural crest development in the Xenopus laevis embryo, studied by interspecific transplantation and scanning electron microscopy.

The Xenopus borealis quinacrine marker and scanning electron microscopy have been used to study the appearance, migration, and homing of neural crest cells in the embryo of Xenopus. The analysis shows that the primordium of the neural crest develops from the nervous layer of the ectoderm and consists of three segments at early neurula stages. This primordium is located in the lateral halves of the neural folds behind the prospective eye vesicles.

Diploid gynogenesis in Xenopus laevis and the localization with respect to the centromere of the gene for periodic albinism ap.

Diploid gynogenetic Xenopus laevis were obtained by inseminating the eggs with u.v. irradiated spermatozoa, and treating them with hydrostatic pressure to inhibit the expulsion of the second polar body.

A reliable new cell marker in Xenopus.

A new reliable and durable method for marking cells in Xenopus is described. It is based on the differential staining of the nuclei of different Xenopus species, e.g.