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.
These cells enable the immune system to recognize antigens that the body has previously encountered. Memory cells direct a secondary immune response in which antibodies and immune cells, such as cytotoxic T cells, are produced more quickly and for a longer period of time than during the primary response.