Assertion: mutation | /r/AtLocation | mutlicellular organism
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text: Of course, even when you get one, that's still just one cell; if the mutation occurs in a mutlicellular organism, then it usually won't actually be expressed unless it occurs very early in the organism's prenatal development (like, when it's still a clump of cells you can count on one hand, or even still a gamete in it's parent's junk).