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The embryonic value of the micromeres in Ilyanassa obsoleta, as determined by deletion experiments. III. The third quartet cells and the mesentoblast cell, 4d
TLDR
Each third quartet micromere and the mesentoblast is judged to have a specific embryonic value and the generally good development of the main ectodermal derivatives of the body following removal of the mesENToblast do not suggest any role for it or its derivatives as the primary... Expand
The embryonic value of the micromeres in Ilyanassa obsoleta, as determined by deletion experiments. I. The first quartet cells
TLDR
The Ilyanassa embryo shows both mosaic and regulative features, and the results are compared with deductions from cell lineage work on the related form Crepidula, and they are considered also from the standpoint of regulative capacity. Expand
Cell Determination and Organogenesis in Molluscan Development: A Reappraisal Based on Deletion Experiments in Ilyanassa
The vegetal region of the Ilyanassa egg, incorporated into the polar lobe and segregated to the D blastomere, appears to have an organizing influence in development. The results of deletingExpand
Protein-Synthesizing Activity of the Anucleate Polar Lobe of the Mud Snail Ilyanassa obsoleta
Polar lobes of eggs of the mud snail Ilyanassa obsoleta, detached at the "trefoil" stage of the first cleavage, are capable of incorporating labeled amino acid into protein. The rate of incorporationExpand
The embryonic value of the micromeres in Ilyanassa obsoleta, as determined by deletion experiments. II. The second quartet cells
TLDR
Each second quartet micromere of Ilyanassa obsoleta is judged to have a different embryonic value on the basis of the deletion experiments. Expand
Development of the vegetal half of the Ilyanassa egg after removal of most of the yolk by centrifugal force, Compared with the development of animal halves of similar visible composition.
  • A. C. Clement
  • Biology, Medicine
  • Developmental biology
  • 1 February 1968
TLDR
It is concluded that the morphogenic influence of the vegetal polar area (polar lobe region) probably does not depend upon the presence of the yolk particles normally found there, and is able to withstand centrifugal force sufficient to displace lipid droplets,Yolk particles, and nuclei. Expand
THE FORMATION OF GIANT POLAR BODIES IN CENTRIFUGED EGGS OF ILYANASSA
TLDR
The close of the maturation division in centrifuged and elongated eggs is attended by the production of clusters of cytoplasmic lobes around the region where the achromatic figure lay, distinct from the normal polar lobe. Expand
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