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Status of protein μ1 after incubation of E3 (a) and EB144 (b) ISVPs at elevated temperatures. ISVPs of T1L × T3D reassortants E3 and EB144 were analyzed as described for T1L and T3D ISVPs for Fig. 3. The position of μ1 fragment δ is highlighted with arrowheads. Fragments derived from the λ2 protein are highlighted by bars (a).
