Gene transcription leads to the generation of pre-mRNA molecules which contain both coding sequences (exons) and intervening non-coding sequences (introns). The primary transcript needs further processing which involves the excision of introns and ligation of exons. This process is called RNA splicing. https://www.bekindtopets.com/limited-stock-Original-U-S-Vietnam-War-Era-Operation-Igloo-White-Seismic-Sensor-Inert-Rocket-great-price/