Buffer gradient gels and 35S label as an aid to rapid DNA sequence determination.

Abstract
Two methods for increasing the length of DNA sequence data that can be read off a polyacrylamide gel are described. A rapid way to pour a buffer concentration gradient gel was developed that, by altering the vertical band separation on an autoradiograph, allows more sequence to be obtained from a gel. The use of deoxyadenosine 5''-(.alpha.-[35S]thio)triphosphate as the label incorporated in dideoxynucleotide sequence reactions increases the sharpness of the bands on an autoradiography and so increases the resolution achieved.