Assertion: immunoglobulin | /r/AtLocation | document d3
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text: In document D3, immunoglobulin lacking a CH1 domain produced by mouse myeloma cells are described while document D12 reports that immunoglobulin heavy chain fragments not associated with immunoglobulin light chains and lacking the entire CH1 domain (but not proved to be involved in antigen-antibody interactions) were found in the urine of a patient having developed a common clinico-pathologic presentation of H Chain Disease (HCD).