Two-way traffic enable proteins to get where needed, avoid disease

It turns out that your messenger RNA may catch more than one ride to get where it's going. Scientists have found that 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. 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 at the Medical College of Georgia at Georgia Regents University.