Author contributions
C.G.Y., X.M.Z. and W.Z.J. designed the research, analyzed data and
revised the manuscript. C.L.Y., J.L. and Y.Y.H. performed experiments,
analyzed data and wrote the manuscript. Q.S.G. and Z.Y.P. collected
samples, performed experiments and analyzed data. S.L.Y. and X.R.
analyzed data. L.C. revised the manuscript and R.C.Y, M.D., H.L.Z.,
H.Q.Z., X.X.J. and X.N.W. collected samples.