title: RNA-Seq of pit mud of Chinese strong-flavor liquor
design: Samples of pit mud were taken using the nine-point sampling method. Nine red spots clearly indicated the specific locations of the sampling of pit mud: the central point of four sidewalls, the four corners of the pit bottom and the center of the pit bottom. A 2cm2cm2cm mud mass at each of the nine points was picked, and then equally mix the nine points of mud mass to get one pit mud sample.