Proteins 1A and 1B are encoded from the same gene. Protein 1A is made up of five different protein domains in the following order: an N-terminal domain, a beta-sheet, a transmembrane domain, a globular domain, and a C-terminal domain.
Protein 1B consists of five domains in the following order: an N-terminal domain, a transmembrane domain, a globular domain, a second transmembrane domain, and a C-terminal domain.
Which is the most likely explanation for this?
protein processing
alternative splicing
frameshift mutation
alternative promoter usage
microRNA regulation