... are very similar. * Author for correspondence (e-mail: [email protected] ) 1 10 2003 © 2004. 2004 Cell lineage Cell interaction Rostral segment Leech Helobdella robusta In segmented animals, segments are characterized as repeating morphological units aligned along...

..., the glossiphoniid leech, Helobdella robusta ,and examined its expression by reverse transcription polymerase chain reaction(RT-PCR) and whole-mount in situ hybridization. The peak of Hro-hh expression occurs during organogenesis (stages 10-11). No patterned expression was detected within the segmented portion...

... precursor cells of the glossiphoniid leech Helobdella robusta . We find that this fusion event is regulated inductively by a cell that does not itself fuse. We also show that biochemical arrest (by microinjection with ricin A chain or ribonuclease A) of the inducer or either of the fusion partners prevents...

...Marc Pilon; David A. Weisblat ABSTRACT From the glossiphoniid leech Helobdella robusta , we have cloned and determined the complete coding sequence of Hro-nos , a gene homologous to the nanos gene from Drosophila melanogaster . Developmental northern blots show that Hro-nos , like nanos...

... tessulatum (Hirudinea, Glossiphomidae) . J Morph 196 , 217 – 252 10.1002/jmor.1051960210 Shankland , M. , Bissen , S. T. and Wiesblat , D. A. ( 1992 ). Description of the California leech Helobdella robusta nov sp, and comparison to H tnsertalis on the basis of morphology...