A surgical hand piece comprises a generally cylindrical horn with a flange on one end. The security module ensures that the rewritten URIs are appended by an authentication identifier for determining whether the rewritten URI has not been changed. The liquid has a boiling point higher than that of water. Each container is configured to divide into particles when the container fractures. Some polypeptides of the invention exhibit unique receptor binding profiles compared to known, naturally occurring vascular endothelial growth factors.