Collagen, Type I, from bovine achilles tendon is a type I collagen derived from bovine achilles tendon, which is widely found in marine invertebrate tissues. Collagen, Type I, from bovine achilles tendon is the only component of collagen fibers that make up the dermis, and plays a major role in bone and connective tissue. connective tissues, and functions primarily by forming and maintaining the integrity of the skeleton.