1976 Volume 120 Issue 3 Pages 269-275
A patient with multiple myeloma who has an IgG-IM-component in serum reacting with both κ and λ light chains in im-munoelectrophoresis is presented. The possibility of ‘hybrid molecule (H2LκL λ)’ is strongly suspected. The absorption studies of the patient's serum employing Anti-κ and anti-A light chains, however, support the view that this apparently single M-component consists of two M-components, IgG 1-κ and IgG 1- λ. The reason why these two M-components possessed the identical electrophoretic mobility is unclear. The possibility is high that these two M-components are produced in the same cell.