Clipping of the RNA lariat
The G of the donor site is
joined covalently to the A of the branch site.
This structure is excised at the 3' end of the acceptor
site, and the ends of the two adjacent exon
equivalents are joined.
Figure © 2012 TA Brown, Introduction
to Genetics (1st ed.); additional
text © 2014 by Steven M. Carr