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Abstract
Development in the sea has long been thought to be a nutritional gamble that disproportionately ends in starvation. Here, we support the premise that components of plastids appear to be incorporated into sea urchin eggs and that these, in turn, benefit development. We find chromoplast-derived carotenoid crystals and chromoplast-specific metabolites inside the eggs of the sea urchi...
This study presents a compelling case for the incorporation of plastid-derived structures in sea urchin eggs, challenging conventional wisdom about the transmission of non-metazoan organelles. The methodology is robust, combining multiple lines of evidence—genomic, microscopic, and metabolic—to support the claim. However, a peer reviewer might flag the reliance on correlational data (e.g., presence of plastid DNA and developmental benefits) without direct mechanistic proof of causation. The stud...