Abstract
The chain-termination method for determining the nucleotide sequence of DNA of Sanger, Nicklen and Coulson was adapted for use with reverse transcriptase (RNA-directed DNA nucleotidyltransferase) on RNA templates. With this method and using a primer (the octanucleotide pdT7rC) directed at the 3''-terminal poly(A), a sequence of 166 residues was determined in the genomic RNA of the picornavirus encephalomyocarditis virus.