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L chain

(Science: immunology) Although light chains are found in many multimeric proteins, l chain usually refers to the light chains of immunoglobulins.

These are of 22 kd and of one of two types, kappa or lambda. A single immunoglobulin has identical light chains (2 kappa or 2 lamda). Light chains have one variable and one constant region. There are isotype variants of both kappa and lamda.