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
MRNA. Definition. noun. Abbreviated form for messenger ribonucleic acid, the type of RNA that codes for the chemical blueprint for a protein (during protein synthesis). Supplement. In prokaryotes, mRNA is produced by splicing a large primary transcript from a DNA sequence. The mRNAs of prokaryotes are usually very short lived (from seconds to more than an hour) and protein synthesis starts even while the mRNA is still being synthesized.