1. The L2C lymphocytic leukaemia in strain-2 guinea pigs is accompanied by a protein in the urine resembling a homogenous immunoglobulin light chain. 2. The amino acid sequence over the first 20 residues demonstrates a close analogy with a human λ chain of V region subgroup IV. 3. The protein is apparently synthesized by the leukaemic cells and thus represents a monoclonal light chain, i.e. a Bence-Jones protein.

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