Resilin's an elastomeric protein found in many arthropods. As of 2005 it's the most efficient elastic protein known (Elvin et al., 2005). The elastic efficiency of the resilin isolated from locust tendon has been reported to be 97 % (only 3 % of stored energy's lost as heat). It's no regular structure but its randomly coiled chains are crosslinked by di- and tri-tyrosine links at the right spacing to confer the elasticity needed to propel some jumping insects distances up to 150 times their leng… (More on Resilin)