You discover a protein, MtA, and find that it binds to the plus ends of microtubules in cells. The hypothesis that best explains this localization is . Group of answer choices MtA will not bind to purified microtubules in a test tube. MtA is important for the interaction of microtubules with the centrosome. MtA binds to GTP-bound tubulin in microtubules. MtA is involved in stabilizing microtubules.