library_construction_protocol: Samples were collected and prepared by following MapR protocol (Q. Yan, K. Sarma. Curr. Protoc. Mol. Biol.130, e113 (2020)). MapR were prepared by following Q. Yan's protocol (Q. Yan, K. Sarma, Curr. Protoc. Mol. Biol.130, e113 (2020) and library were prepared by using NEBNext Ultra II DNA Library Prep Kit, and following the manufacturer's instructions.)