made use of echinoderm embryonic cells to address the mechanisms of cytokinesis in animal cells, experiments that focused on understanding how the cytokinetic furrow is positioned, and understanding the nature of the stimulus from the mitotic spindle that induced cortical furrowing.

He did pioneering research using physical manipulations of cells to understand the mechanisms of cytokinesis, the process by which a cell's cytoplasm is divided in two.

. Rappaport held several administrative positions at the MDI Biological Laboratory, including director (1956–1959), trustee, and president of the corporation (1979–1981).[1][3] Rappaport also architecturally designed some of the buildings at the laboratory, including several cottages, laboratory buildings, and the dining hall.[4][3]

f you have a rubric with too many additional clauses, it’s often an indication that it’s too complex.