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Silver staining after isoelectric focusing on polyacrylamide gel of serum and cerebrospinal fluid (CSF) of oligoclonal bands (OCB) type 1 (a), OCB type 2a (b), OCB type 2 (c), OCB type 3a (d), OCB type 3 (e), OCB type 4 (f), OCB type 5 (g). Arrow indicates CSF restricted OCB in borderline types.
