Single-molecule RNA FISH data showing transcriptional burst sites. Stellaris® FISH Probes recognizing human a POLR2A (labeled with Quasar®570, # VSMF-2294-5), b GAPDH (labeled with Quasar®570, # VSMF-2026-1), c ERBB2 (Her-2/neu) exons (mRNA, green, labeled with Quasar®570, # VSMF-2102-5), and d intron specific (red, Quasar®670, # ISMF-2103-5) in human A549 cells (Images courtesy of LGC Biosearch Technologies)