An Interactive Introduction to Organismal and Molecular Biology, 2021

PROTEIN SYNTHESIS II: RNA PROCESSING | 157
An example of
alternative splicing.
Each number is a
different exon, and
not all exons are
expressed. For
example, a
pre-mRNA with
exons 1, 2, 3, 4 may
express exons 1, 2,
and 3 in one cell
type and exons 1, 3,
and 4 in another
cell type.
Here is another representation of alternative splicing—this one does not label the introns (assume the molecule
segment between the exons are introns), like the previous but it shows how alternative splicing impacts the
protein.