In a first step it was necessary to characterize the sequence of the human -adrenergic receptor. Firstly, sequencing the complete structure gene of the receptor from both, salt resistant and salt sensitive subjects was performed. Secondly, the revealed sequences were compared with published gene sequences[77, 78]. Based on the results obtained and the mutations discovered screening methods for rapid screening of these mutations had to be developed. Furthermore, the sequencing results were used as references for the scanning methods described later on (see chapter 4).