NanoCAGE analyses unveil atypical expression of OR genes. a) Validation of OR gene expression in mouse midbrain. MB was dissected from C57Bl/6 mouse and total RNA extracted and used for non-quantitative PCR. Primers were designed to specifically amplify selected ORs, as shown. RNA from OE was included as a positive control. Non-retrotranscribed (-RT) RNA was used as a negative control. Arrows indicate OR specific bands. Data are representative of n = 3 replicas from independent tissue preparations. b) Representative tracks of nanoCAGE sequencing data of libraries from A9 and A10 mDA neurons. Data from OE (Plessy et. al., Genome Research, ) are included for comparison. Genomic coordinates are shown on top and expression values (TPM) on the right. Positive and negative TPM values indicate transcription on plus and minus DNA filament, respectively. Black arrows in each track highlight TSS. At the bottom, annotated RefSeq is shown in grey and thick arrowheads indicate direction of transcription.