The test may cause momentary gagging because the back of the throat is a sensitive area, but it should not be painful. The sample your doctor collects is taken to a laboratory, where it is put on a plate that allows any bacteria on it to grow. This process is called a culture.
Often these are called transition zones which represent the start and end of a specific region and can be large or small. For example, the transition zone between Sub-Saharan Africa and North Africa is rather large because there is a mixing between the two regions. Regional geographers study this zone as well as the distinct characteristics of Sub-Saharan Africa and North Africa.
Transition zone speed limits are typically set to divide the overall speed reduction approximately in half. For instance, a speed limit decrease from 60 mph (100 km/h) to 30 mph (50 km/h) might use a transition speed limit of 45 mph (70 km/h) or 50 mph (80 km/h).