A mRNA may travel one way down a cell, then board another, aptly named motor protein and head in the opposite direction to get where it ultimately needs to be, finds scientists. It turns out that your messenger RNA may catch more than one ride to get where it's going. It's a pretty important journey, because mRNA determines which proteins a cell expresses, differentiating a brain cell from, say, a muscle cell, said Dr. Graydon B. Gonsalvez, cell biologist ...
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