At the symposium, Matthew Teasdale, a postdoc in Dan Bradley's lab at Trinity College in Dublin, reported on the biology of another valuable text: the York Gospels, thought to have been written around 990 C.E. DNA from this book's eraser shavings showed that, aside from some sheep, its
pages were mostly
calfskin — mainly from female calves, which was unexpected because cows were usually allowed to grow up to bear offspring.