A peptone resulting from gastric digestion of elastin (protein that coils and recoils like a spring within the elastic fibers of connective tissue).

Peptones are any of various soluble compounds that do not coagulate, are obtained by acid or enzyme hydrolysis of natural protein, and are used as nutrients in culture media.

Elastin is a protein that coils and recoils like a spring within the elastic fibers of connective tissue and accounts for the elasticity of structures; such as, the skin, blood vessels, heart, lungs, intestines, tendons, and ligaments.