Abstract
A normal serum protein that crossreacts with rabbit anti-mouse Ss serum was isolated by alternating gel nitration and ion exchange chromatography from the inbred Long-Evans (LGE) rat strain. Rabbit antisera prepared against this protein detected it in the sera of all inbred and individual wild rats tested. The close physical and immunochemical similarity between this protein and the mouse C4 component of complement (Ss protein) indicates that this protein may represent the rat homolog of the mouse C4. Quantitative differences in the level of the Ss-like rat protein, comparable to those seen in Ss low mice, were not observed in 25 inbred strains or 22 individual wild rats. These quantitative results were supported by functional assays for total hemolytic complement and individual C2, C3, and C4 complement components. Sixteen inbred strains were examined and all had normal levels of activity for each of the assays.
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Knauer, G., Cramer, D.V., Mowbray, J.F. et al. Detection of an Ss-like protein in the sera of inbred and wild rats. Immunogenetics 6, 323–332 (1978). https://doi.org/10.1007/BF01563924
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DOI: https://doi.org/10.1007/BF01563924