The major capsid protein VP1 encoded by genome segment S1 of Bombyx mori cypovirus 1 was expressed in a baculovirus system. In the absence of any other capsid proteins, VP1 was found to assemble into single-shelled virus-like particles. The VP1 particles were more sensitive to acidic conditions than were intact particles.
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Hagiwara et al. (2003) studied this question.
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