An electrophoretic and immunoelectrophoretic study of serum proteins during the life cycle of the lamprey, Petromyzon marinus L.

Serum proteins of upstream migrants, parasitic adults, early and late metamorphosing animals, and ammocoetes of Petromyzon marinus L. were examined by polyacrylamide gel electrophoresis and crossed-immunoelectrophoresis. The electrophoretic patterns for two proteins, SDS-1 and CB-III, were found to change during the life cycle. quantitative measurements of these two proteins showed that they continued to increase until in the adult they together constituted approx. 85% of the total serum protein. Evidence was obtained for a protein present in ammocoetes and metamorphosing animals, but not in upstream migrants.