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Such a division is described as dexiotropic if the clockwise daughter cell (in animal pole view) is the closer to the animal pole; in a laeotropic division the counterclockwise cell is closer to the animal pole.
The second quartet micromeres (2m) are formed by laeotropic division of the macromeres 1M.
Also applying to shellfish are dexiotropic and laeotropic, where the shell's spire turns to the right and left, respectively.
(C) Formation of the second micromere quartet by laeotropic division; the first-quartet cells in this species also divide laeotropically, but with a slight delay (a much longer delay occurs in
The division of each micromere is laeotropic and unequal, separating a large cell (1m