1 National Engineering Laboratory for Animal Breeding, Ministry of Agricultural Key Laboratory of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
2 Hebei Provincial Institute of Cultural Relic, Shijiazhuang 050031, China;
3 Xushui County Office for Preservation of Ancient Monuments, Xushui 072550, China;
4 Institute for Biochemistry and Biology, Faculty of Mathematics and Natural Sciences, University of Potsdam, 14476 Potsdam, Germany; and Department of Biology, University of York, York YO10 5DD, United Kingdom zhxb@cau.edu.cn michi@palaeo.eu.
5 National Engineering Laboratory for Animal Breeding, Ministry of Agricultural Key Laboratory of Animal Genetics, Breeding and Reproduction, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China; zhxb@cau.edu.cn michi@palaeo.eu.