Microtubules are regulated by a variety of proteins in neurons, including molecular motor proteins. Molecular motors transport organelles along the microtubule, but can also transport the microtubules themselves and organize them into regionally distinct patterns.n neurons, microtubules are also nucleated at the centrosome (located in the cell body of the neuron), but the microtubules are then severed from the centrosome so that they can be deployed into axons and dendrites.
Self employment taxes are comprised of two parts: Social Security and Medicare. You will pay 6.2 percent and your employer will pay Social Security taxes of 6.2 percent on the first $127,200 of your covered wages. You each also pay Medicare taxes of 1.45 percent on all your wages - no limit.
One of the biggest misconceptions about the U.S. tax code is that a large portion of Americans do not pay federal taxes. Although it is true that the bottom 40 percent of income earners pay no individual income tax, they face payroll taxes if they are working. In fact, about 80 percent of American taxpayers pay more in payroll taxes than in individual income taxes.