Many sites around the world claim to hold relics of the saint, including the Grand Mosque in Damascus which says it has his head.
Countries around the Mediterranean claiming to have remains include Turkey, Greece, Italy and Egypt.
Individual collagen molecules contain three polypeptides of about 1000 amino acids per chain with a high glycine and hydroxyproline content.
Bundles of these collagen molecules are arranged in fibrils with a molecular weight close to 97.1 Daltons.
For instance, if we find a fossil bone below the strata 3 rock level shown above, we assume that the animal most likely lived at a time before that layer was formed.