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Universal Veil: In fungi, a structure that covers an immature fungus, and can resemble an egg. As the fungus grows, this structure will break apart, and can remain attached to the fungus.

Uracil: A nitrogenous base that pairs with adenine in RNA. When you see a string of letters that are used to describe RNA, such as AGUCCGUUAUAUUGC, "U" stands for uracil.