Acknowledgments
This study was financially supported by the National Research Foundation
of Korea (2017R1A2B3004972, NRF-2020R1F1052024), the Research Institute
of Veterinary Science and the BK21 PLUS Program for Creative Veterinary
Science Research, and a SNU-Grant (#550–2020005). We also thank
members of the G. Jang lab for their valuable comments and the technical
support of SR Han and SY Yum