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a Negatively stained particles of the viral strain isolated in October 2015 on M. spinulatus RCC4659. As all virions displayed similar morphological features, micrographs of the other viral strains are not shown. b Ultrathin section of M. comicus infected by its associated virus. Arrowheads: viral particles accumulated in the host cytoplasm, F frustule, M mitochondrion, N nucleus, CH chloroplast.
