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Maximum-likelihood phylogenetic tree of D. pulchra associated Picornavirales based on the RdRp amino acid sequence compared to environmental sequences (AY285750-AY285768) of virioplankton communities of geographically diverse regions (Culley et al., 2003) and to the families Iflaviridae, Picornaviridae, Dicistroviridae, and Secoviridae. NCBI accession numbers are shown in brackets. The scale bar represents 20% of amino acid changes between close relatives.
