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Titin's existence in all mammals with muscles is expected, as it plays a huge role in important muscle use. The evolutionary trees show that the development of Titin in mammals matches the development of mammals throughout time. The similarities between the trees show that as mammals evolved, Titin remained a constant presence in all mammals with skeletal muscles.

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The protein Titin originates early on in the evolutionary tree, given its important role in the construction and function of skeletal muscles.

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Don't mind me. I'm just here to make sure the page is tall enough. Carry on!

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Titan contributes greatly to the assembly of new sarcomeres and other skeletal machinery. Containing binding sites for muscle-related proteins, it acts as a template for the assembly of contractile machinery in muscle cells.

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TNN will be present in all organisms with muscles.

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Where did the version of TNN that humans use originate on the evolutionary tree?

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Purpose                              #6   

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Purpose                              #6   

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While it is used in different forms throughout the body, it is most commonly found in muscles used for movement (skeletal muscles) and those used in the heart (cardiac muscles).

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Titin in Muscles                                         #3

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Titin in Muscles                                         #3

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Titin works with other muscle proteins to keep the components of sarcomeres in place as the muscles relax and contract. Spanning half the length of the sarcomere at over one micrometer long, Titin provides structure, flexibility, and stability to the cell structures of the sarcomeres.

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Sarcomeres are made of proteins that provide the force needed to  make muscles contract.

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(Start Here)
Holds on to the sarcomere inside of a muscle and stretches and contracts to lengthen and shorten the size of a muscle, allowing it to safely contract and relax.