How living systems break symmetry in an organized manner is a fundamental question in biology. In wild-type Caenorhabditis elegans zygotes. symmetry breaking during anterior-posterior axis specification is guided by centrosomes. resulting in anterior-directed cortical flows and a single posterior PAR-2 domain. https://www.markbroyard.com/super-value-krowne-18-x84-back-bar-drain-board-and-sink-sale-limited-save/