Plural form of gastrula; multiple gastrula-stage embryos.
Latin plural ending '-ae' applied to 'gastrula,' following standard scientific nomenclature for organizing groups of organisms in their early developmental stages.
When biologists use 'gastrulae,' they're speaking the language of precision—one tiny embryo is a gastrula, but studying hundreds of them together is studying gastrulae, which reveals developmental patterns invisible in a single specimen.
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