Titin is one of the proteins that make up the muscles of all vertebrates; it is an elastic protein that acts as a spring by refolding and returning to its original state."Protein evolution has been studied from many points of view: its thermal stability, function and structure, but no one had ever studied the evolution of the mechanical properties of a protein.Once they had the sequences, they synthesised the most elastic fragment of the proteins in the laboratory, and using an atomic force microscope available at nano GUNE, they were able to measure the mechanical resistance of each of the proteins.

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This is a method that does not find the age in years but is an effective technique to compare the ages of two or more artifacts, rocks or even sites.

It implies that relative dating cannot say conclusively about the true age of an artifact.

For titin this is a particularly appropriate approach given its function," said Pérez-Jiménez.

For this research, they selected over thirty animals from different taxonomic groups and of different sizes.