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Cross-reactivity of T cells immune to individual Rpf-like proteins. Lymph node cells were obtained from immune mice, and their capacity to proliferate in vitro in response to the immunizing as well as to relative Rpf-like proteins was assessed as described in Materials and Methods. Results of two similar experiments are summarized and expressed as percentages of the antigen (Ag)-specific (Δcpm = cpmAg - cpmcontr) reactivity. Asterisk, not determined.
