Among the exons in a primary RNA transcript, two are subject to alternative splicing. In RNA processing, one or the other or neither or both regions may be excised from the primary transcript as introns. How many different amino acid sequences could this transcript encode?

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Given two exons subject to alternative splicing, each exon can either be included or excluded, leading to four possible combinations: both included, both excluded, only the first included, or only the second included. Each combination could potentially encode a different amino acid sequence.

Among the Exons in a Primary RNA Transcript, Two Are