title: GSM7883608: PTC-4; Homo sapiens; RNA-Seq
library_construction_protocol: Human serum exosomes were isolated by density-gradient centrifugation over Ficoll-Hypaque solution (Tianjin Haoyang Biological Technology Co., Tianjin, China) according to the manufacturer's instructions and stored at -80 °C   until use for circRNA sequeHCing RNA libraries were prepared for sequeHCing using standard Illumina protocols