Yum yum. (Letters).While reading your article regarding the primitive antibodies found in lancelets ("First Line of Defense: Hints of primitive antibodies," SN: 11/9/02, p. 294), it occurred to me that complex immune systems immune system Cells, cell products, organs, and structures of the body involved in the detection and destruction of foreign invaders, such as bacteria, viruses, and cancer cells. Immunity is based on the system's ability to launch a defense against such invaders. might be merely a highly specialized, evolved form of digestion. Presumably pre·sum·a·ble adj. That can be presumed or taken for granted; reasonable as a supposition: presumable causes of the disaster. , evolutionary adaptation would tend to favor a critter that found a way to consume even those nasty, yucky, infectious microbes. MEL (Maya Embedded Language) See Maya. Mel - The story of Mel ZERNOW, COLUSA, CALIF. |
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