. You are analyzing two different cells that transcribe the same gene called neurexin (NRXN). The initial NRXN primary MRNA transcript (prior to processing) is identical in the two cells, but the MRNA that exits the nucleus to be translated in the cytosol is composed of a different combination of exons, though the 5' and 3'UTRS are identical. The two different mRNA transcripts now encode proteins with differences in their amino acid sequences. What are the two different versions of the NRXN protein are referred to as? How were different versions of the NRXN protein produced in the cells? What proteins and sequences were involved?

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