Use of Hybrids between Xenopus laevis and Xenopus borealis in Chimera Formation: Dorsalization of Ventral Cells. (cell lineage/chimera/hybrid/Xenopus/dorsalization)

Functional difference between the sites of ribosomal 40S precursor 3' end formation in Xenopus laevis and Xenopus borealis.

In the ribosomal genes of X. laevis, the sequence GACTTGCNC is found about 60bp upstream of the gene promoter (T3) and is necessary and sufficient to cause termination of RNA polymerase I transcription. At the 3' end of the 40S precursor coding region (T2) a sequence differing by one nucleotide, GACTTGCNG, directs RNA 3' end formation but allows polymerase to transcribe on into the intergenic s...

Paternal gene expression in developing hybrid embryos of Xenopus laevis and Xenopus borealis.

We have studied protein synthesis in the viable hybrid Xenopus laevis (female) X Xenopus borealis (male) using 2D gel electrophoresis. Fourteen borealis-specific proteins were studied. Two of these proteins appeared by the gastrula stage, five in the gastrula and the rest later. Where homologous laevis proteins were tentatively identified, androgenetic haploid hybrids were used to study whether...

ترتیب اعصای جانبی در دم لارو of Xenopus laevis

The relationship between cleavage and blastocoel formation in Xenopus laevis

The development of the blastocoel in Xenopus laevis was studied by electron microscopy. Two major morphological specializations were associated both with blastocoel formation and with cleavage. The first specialization was the formation of close junctions at specific points along cleavage furrows, starting as early as the first division. The second was the secretion of material into the blastoc...

The relationship between cleavage and blastocoel formation in Xenopus laevis

The development of the blastocoel in Xenopus laevis was studied by electron microscopy. Two major morphological specializations were associated both with blastocoel formation and with cleavage. The first specialization was the formation of close junctions at specific points along cleavage furrows, starting as early as the first division. The second was the secretion of material into the blastoc...