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The vertebrate immune system is composed of two parts, innate immunity which recognizes the invading microbes using germline-encoded molecules, and adaptive immunity, which depends on recognition molecules generated by somatic mechanisms during the ontogeny of each individual organism ( 1997).

All data available to date indicate that adaptive immunity became established at the early stage of vertebrate evolution around the time of cartilaginous fish emergence.

Thus the genes which encode the pivotal elements of adaptive immunity, such as immunoglobulin ( 1995) have been identified in cartilaginous fish and higher vertebrates.

In contrast, vertebrate innate immunity is believed to have a more ancient origin, and an apparently primitive complement system has been found in lamprey ( et al. However, it was not clear until recently whether the origin of the complement system can be traced back to invertebrate.

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