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Envelope glycoprotein incorporation into virions with mutated MA. The presence of the TM glycoprotein indicates glycoprotein incorporation into the virions. Lanes 1 and 6, negative control; lanes 2 and 7, wild-type positive control; lane 3, Arg3-Leu; lane 4, Arg33-Leu; lane 5, Lys51-Ile; lane 8, Arg7-Leu; lane 9, Lys47-Ile.
