STEP³ is an effective algorithm and toolkit for predicting high-throughput phage virion (structual) proteins. It ensembles five PSSM-based models, to accurately identify phage virion (structual) proteins. Additionally, for each predicted phage virion (structual) proteins, STEP³ visualizes its closest relationship with known phage virion (structual) proteins based on the sequence similarity and phylogenetic tree, as to facilitate users infer its possible subtype.

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