The Japanese word for Japan is æ¥æ¬, which is pronounced Nippon or Nihon and literally means the origin of the sun. The earliest record of the name Nihon appears in the Chinese historical records of the Tang dynasty, the Old Book of Tang.
Primary versus Secondary Immune Response The primary immune response occurs the first time that the immune system comes in contact with the antigen.
In this first encounter, there are only a few cellsthat can mount an immune response and the response isrelatively weak. This is called a primary immune re-sponse (figure 57.18).If the primary immune response involves B cells, somebecome plasma cells that secrete antibodies, and some be-come memory cells.