The plant agglutinin, Dolichos biflorus lectin, has been said to be a representative anti-A₁ plant agglutinin.
However, a new blood group factor Wk which we have recently found has been shown to be very reactive on this Dolichos lectin.
It has also been revealed that N-acetyl-D-galactosamine is the very substance that occurs in the Wk factor and the A substance in common, and reacts on Dolichos lectin.
It has been disclosed that N-acetyl-D-galactosamine is not the A type determinant but is intimately related with the structure of the A substance.
It has been shown that Dolichos biflorus lectin is not the anti-A₁ plant agglutinin but a lectin specifically reactive on N-acetyl-D-galactosamine.
Limma bean lectin has been shown to be in no way related with the Wk factor but to be a plant agglutinin specifically reactive only on the A substance.

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The human blood cell that had an factor in common with the turtle blood cell was discovered (in Mr. Wakatsuki), and this common factor was discovered (in Mr. Wakatsuki), and this common factor was named Wk factor.
The Wk factor proved to be an entity entirely independent of the known heterogenetic antigens such as Forssman's antigen, Eisler-Kagatani's antigen, Schiff-Adelsberger's antigen and Castaneda's X antigen.
Of Mr. Wk's family, his younger sister and two of his children were Wk positive (+): thus, it was clear that the Wk factor had been inherited.
From this phenomenon, the Wk factor may be said to be one of the human blood factors.
The occurrence of the Wk (+) type in man has hitherto been limited to Mr. Wk's family, but has not been found in any other family.
In view of these facts, the Wk factor appears to be a kind of family antigen.

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This is to report on the Anti-Fy^b considered to be a natural antibody which was found in a screening test for irregular antibodies carried out with blood samples taken from healthy male blood donors who had had no blood transfusion.

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