Abstract
The presence of lectins in the humoral fluids of amphioxus, an animal transitional from invertebrates to vertebrates, has thus far not been reported. It was shown here that lectins are present in the humoral fluids of amphioxus. The lectin activity in the humoral fluids of amphioxus is SH group-dependent and is specifically inhibited by various D-galactosides. Also, the humoral fluids obtained from E. coli-injected amphioxus showed increased agglutinating activity against human B and O, rabbit, grass carp and toad erythrocytes, suggesting that a form of adaptive response might exist in amphioxus.
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