A pinned layer structure of a spin valve sensor includes a laminate of alternating layers of cobalt iron and cobalt iron oxide. The invention provides antigenic peptides, and pharmaceutical compositions comprising complexes of antigenic peptides and adjuvants that can activate an immune response against herpes viruses. An absorption layer is formed on the first layer of dielectric material. In addition, provided is a process for producing L-proline-4-hydroxylase using the transformant which contains the gene and has a reinforced proline biosynthesis activity.