RT Journal Article SR Electronic T1 Use of anti-idiotypic antibodies to demonstrate rheumatoid factor producing bone marrow cells in essential mixed cryoglobulinaemia. JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 651 OP 652 DO 10.1136/ard.43.4.651 VO 43 IS 4 A1 Gharavi, A E A1 Campion, G A1 Hughes, G R YR 1984 UL http://ard.bmj.com/content/43/4/651.abstract AB Specific cells producing rheumatoid factor (RF) were demonstrated in a bone marrow preparation of a patient with essential mixed cryoglobulinaemia. This was achieved by the use of labelled anti-idiotypic antibodies raised against purified RF from the patient's circulating cryoglobulin. This technique may be applicable to other diseases in which specific antibodies are pathogenetically implicated. The more precise demonstration of specific antibody-producing marrow cells may in addition have therapeutic implications.