Protein expansion is primarily due to indels in intrinsically disordered regions.

Abstract excerpt

Proteins evolve not only through point mutations but also by insertion and deletion events, which affect the length of the protein. It is well known that such indel events most frequently occur in surface-exposed loops. However, detailed analysis of indel events in distantly related and fast-evolving proteins is hampered by the difficulty involved in correctly aligning such sequences. Here, we circumvent this...

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