...Loïc Bideau; Zoé Velasquillo-Ramirez; Loeiza Baduel; Marianne Basso; Pascale Gilardi-Hebenstreit; Vanessa Ribes; Michel Vervoort; Eve Gazave ABSTRACT The capacity to regenerate lost tissues varies significantly among animals. Some phyla, such as the annelids, display substantial regenerating...

... axis. Recent studies show that BMP signaling establishes the dorsal-ventral axis in some mollusks. However, previous pharmacological inhibition studies in the annelid Capitella teleta , a sister clade to the mollusks, suggests that the dorsal-ventral axis is patterned via Activin/Nodal signaling. Here...

...Ayaki Nakamoto; Lisa M. Nagy; Takashi Shimizu Among spiral cleaving embryos (e.g. mollusks and annelids), it has long been known that one blastomere at the four-cell stage, the D cell, and its direct descendants play an important role in axial pattern formation. Various studies have suggested...

... . 3 , 890 -904. Pilon, M. and Weisblat, D. A. ( 1997 ). A nanos homolog in leech. Development 124 , 1771 -1780. Ramirez, F.-A., Wedeen, C. J., Stuart, D. K., Lans, D. and Weisblat, D. A. ( 1995 ). Identification of a neurogenic sublineage required for CNS segmentation in an Annelid...

... reveal extensive similarities between expression during regeneration and fission, consistent with the idea that similar developmental processes underlie these two types of development. Thus, we argue that in these annelids fission may have evolved by recruitment of regenerative processes. Furthermore...

...Asuna Arai; Ayaki Nakamoto; Takashi Shimizu ABSTRACT In embryos of clitellate annelids (i.e. oligochaetes and leeches), four ectodermal teloblasts (ectoteloblasts N, O, P and Q) are generated on either side through a stereotyped sequence of cell divisions of a proteloblast, NOPQ. The four...

... for correspondence (e-mail: [email protected] ) 17 5 1999 5 7 1999 © 1999 by Company of Biologists 1999 Annelid Leech Helobdella robusta Cell fusion Endoderm Ricin A chain Syncytium Syncytial yolk cells (SYCs) are a prominent embryonic feature in many annelid...

... with cells in another ectodermal lineage is necessary and sufficient to induce o/p blast cells to assume the P fate. In the absence of this contact they assume the O fate. 23 02 1996 © 1996 by Company of Biologists 1996 equivalence group leech annelid cell interactions Helobdella...

... 02 1996 © 1996 by Company of Biologists 1996 epiboly gastrulation leech annelid Gastrulation is a fundamental process in animal development, during which cells rearrange to form distinct germ layers and begin to elaborate the adult body plan ( Trinkaus, 1984a...

... 18 04 1995 © 1995 by Company of Biologists 1995 engrailed segmentation gangliogenesis leech annelid Questions as to how homologous developmental processes are realized at the cellular and molecular level in various organisms have reinvigorated studies in the area...

... micromeres. * Present address: Department of Anatomy and Cell Biology, Emory University School of Medicine, Atlanta, GA 30322, USA 01 09 1994 © 1994 by Company of Biologists 1994 cell lineage cell ablation fate map leech embryo micromere annelid Glossiphoniid leeches...

...Deborah Lans; Cathy J. Wedeen; David A. Weisblat ABSTRACT ht-en is an engrailed -class gene that is expressed during early development and neurogenesis in embryos of the leech Helobdella triserialis . During the early development of this annelid (stages 7-9), ht-en is expressed in each...

...Cathy J. Wedeen; David A. Weisblat ABSTRACT ht-en protein, an annelid homolog of the Drosophila engrailed protein, is expressed during both early development and neurogenesis in embryos of the leech, Helobdella triserialis . In Helobdella as in Drosophila , early expression is in segmentally...