design: Specimens of the S, B, and R groups were divided into 9 pools, including three RNA pools (sAi_S1, sAi_S2, sAi_S3; one individual per pool) for the S (as a control), three RNA pools (sAi_B1, sAi_B2, sAi_B3; one individual per pool)  for B, and three RNA pools (sAi_R1, sAi_R2, sAi_R3; one individual per pool)  for R. All pooled samples were stored at -80 C until RNA extraction.