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Robert Morton, an Australian biochemist, had recently found that baker's yeast contained a cytochrome (a protein involved in electron transfer in cell metabolism) with a DNA component. That DNA proved to have different base ratios than the yeast's nuclear DNA. He had suggested that this DNA could be used in understanding nucleotide sequences, and Kornberg had been working with some samples Morton sent, looking at their ability to prime DNA synthesis with his polymerase. In this letter, he reported some of his findings to Morton.
Original Repository:
Stanford University Libraries. Department of Special Collections and University Archives. Arthur Kornberg Papers