Plural form of blastula using English pluralization; multiple embryos in the blastula stage.
From blastula + English plural '-s'. The '-s' plural is now commonly used in English scientific writing alongside the Latin '-ae' form.
English and Latin are fighting in scientific language—'blastulas' vs 'blastulae'—and English is winning! Modern biology textbooks use 'blastulas' much more than the Latin form.
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