How can transcription be terminated?
In the genetic code, a stop codon (or termination codon) is a nucleotide triplet or codon within messenger RNA that signals a termination of the translation of a protein.
Stop codons signal the termination of this process by binding to release factors, which cause the ribosomal subunits to disassociate, releasing the amino acid chain.
These are the codons found in RNA: UAG, UAA and UGA.
The start codon is AUG and the stop is UAG. You can see the protein growing and then being released by the stop codon.