Complex sentence: The PPII structure widely exists in elastomeric proteins, such as abductin, elastin, and titin (5), and is believed to contribute in the self-assembling process and the elasticity of the protein.
Split into simpler sentences: The PPII structure widely exists in elastomeric proteins, such as abductin, elastin, and titin. It is believed to contribute in the self-assembling process and the elasticity of the protein.