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The results presented here show that Fab' antibody fragments directed to complement proteins C5, C6, and C7 inhibit lymphocyte stimulation in mixed lymphocyte culture (MLC) by up to 65%, as determined by decreased incorporation of 3H-thymidine. Lymphocyte stimulation induced by PHA-mitogen was also inhibited up to 100% by anti-C5 Fab'. Specificity of these reactions was established by the findings that goat anti-C5 or murine hybridoma anti-C5 both inhibited MLC; the inhibitory activity ofdoi:10.4049/jimmunol.131.2.886 fatcat:zagaizjrzbdmdbrypzeb7sqtti