An unconventional approach to purifying CCK receptor protein to sequenceable-grade homogeneity has been discovered. By this approach, CCK receptor protein can be obtained and sequenced routinely from a variety of sources, and from the sequence information thus obtained it is possible to prepare oligonucleotides suitable for cloning CCK receptor genes. 'CCK receptor' in this context denotes any from a group of proteins that displays a characteristic CCK binding affinity and that is encoded by a nucleotide sequence which hybridizes an oligonucleotide probe designed in accordance with the criteria elaborated herein.
CLONING AND FUNCTIONAL EXPRESSION OF CHOLECYSTOKININ RECEPTOR-ENCODING DNA