These primitive fishes lack jaws and the paired pelvic and pectoral fins characteristic of more advanced fishes. The two living types are the bloodsucking lampreys and the scavenginghagfishes. Fishes of the extinct class Placodermi, the armored fishes, were the first vertebrates to develop jaws ...
Among its many applications is the formation of bone (Type I), cartilage (Type II), and blood vessel walls (Type III), as well as presenting an exciting ability to delay the natural aging process of the human tissue [69]. This protein is non-cytotoxic, biocompatible, and biodegradable. ...