For Heathrow Terminal 4, follow the signs inside the terminal building for the free shuttle bus service to Heathrow Central train station, where you can get on the Heathrow Express train. The shuttle service from Terminal 4 departs every 15 minutes and is a 4 minute journey.
Definition of transcript 1 a: a written, printed, or typed copy; especially: a usually typed copy of dictated or recorded material b: an official or legal and often published copy
The gene is defined in reference to the start site-those sequences before the start site are called the upstream sequences, those after the start site are called downstream sequences. The immediate product is the primary transcript.