A pronucleus (plural: pronuclei) is the nucleus of a sperm or an egg cell during the process of fertilization, after the sperm enters the ovum, but before they fuse.
Definition from Wiktionary, a free dictionary
noun, plural -cle·i /-kliˌaɪ / Pronunciation Key - Show Spelled Pronunciation [-klee-ahy] Pronunciation Key - Show IPA Pronunciation. Cell Biology.
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