1. McDonald Institute for Archaeological Research, University of Cambridge, Downing Street, Cambridge CB2 3ER, UK
2. Department of Biochemistry, University of Cambridge, Downing Site, Tennis Court Road, Cambridge CB2 1QW, UK
3. Department of Plant Resources, College of Industrial Science, Kongju National University, Yesan 340‐702, Korea
4. Department of Archaeology, University of Cambridge, Downing Street, Cambridge CB2 3DZ, UK