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.
The secondary immune response occurs the second time (3rd, 4th, etc.) the person is exposed to the same antigen. At this point immunological memory has been established and the immune system can start making antibodies immediately.
Clonal selection is part of the primary immune response. A primary immune response is provoked when a new antigen invades the body. Traveling through the circulatory system, the antigen will inevitably meet up with the lymphocyte that has the correct antibody pattern.