Sagan Z., Feliñska C., 1973. Studies on a new group feature of the eel erythrocytes - An(b). Acta Ichthyol. Piscat. 3 (2): 87-89.

It has been established that while absorbing certain horse sera with the An(a) eel erythrocytes, the anti An(b) sera can be obtained. This serum agglutinates mainly the eel erythrocytes that have not been agglutinated with the anti-An(a) sera.