As a consequence to the study outlined in the previous chapter, it was necessary to establish a fast method for detecting the described mutations of the 2ar. The receptor gene has proved to show an increased polymorphism , as the sequence analysis of only nine subjects revealed four different alleles. We hoped to be able to associate one or more of the found point mutations (see section results) with an established phenotype. Therefore, in an extension of the previous study, a scanning method for the detection of these mutations was developed, and the mutation pattern of persons with known receptor density was determined.