library_construction_protocol: Total RNA from zebrafish embryos or HEK293T cells was extracted using TRIzol (ThermoFisher #15596026). Sequencing was performed on PCR amplicons of the 3'UTR of Recorder mRNA containing NORAD RNA tiling fragments. The PCR reaction was carried out to amplify the 3'UTR region of the Recorder mRNA, which includes NORAD fragments and the Recorder hairpin. Partial Illumina adapters present in the Recorder mRNA are complementary to sections of the i5 and i7 TruSeq Illumina primers, which also contain unique barcodes and sequencing adapters.