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- W2025286956 abstract "A red cell IgM autoantibody with anti-e specificity was identified in the serum of a rhesus-negative (rr) patient presenting with haemolytic anaemia and a negative direct antiglobulin test. The autoantibody strongly agglutinated normal allogeneic rhesus-negative (rr) red cells in saline at 37 degrees C but had only weak activity for autologous red cells. Incubation of the patient's serum with subpopulations of normal allogeneic red cells obtained by density fractionation, demonstrated that the strong agglutinating activity of the autoantibody was for red cells with density greater than 1.090 g/ml. Young red cell subpopulations of lower density gave weak reactions and low titration scores equivalent to those obtained with autologous red cells during the haemolytic episode. The patient's red cells during remission however, when the patient's haemoglobin level had returned to normal, were strongly agglutinated by serum samples taken during the haemolytic episode; as was the case with normal allogeneic red cells, the strong activity was for patient red cells with density greater than 1.090 g/ml, red cell populations of lower density giving low titration scores. The findings in this case indicate that the patient's red cells which had survived haemolysis during the haemolytic episode were young red cells (density less than 1.090 g/ml), the weak sensitization of these cells being insufficient to cause their destruction by macrophages. Furthermore, these findings, together with observations that IgG autoantibodies may also bind less strongly to young red cells [Gray et al., Br. J. Haemat., 55: 335-345, 1983; Branch et al., Blood 63: 177-180, 1984].(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2025286956 date "1987-03-01" @default.
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- W2025286956 title "An Autoantibody with Activity Dependent on Red Cell Age in the Serum of a Patient with Autoimmune Haemolytic Anaemia and a Negative Direct Antiglobulin Test" @default.
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- W2025286956 doi "https://doi.org/10.1111/j.1423-0410.1987.tb02993.x" @default.
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