Computational protocol: Hidden Markov Models for Evolution and Comparative Genomics Analysis

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[…] Protein sequences of Gram-negative bacteria were downloaded from GeneBank release 175 ( Orthologous protein groups were downloaded from the NCBI Protein Clusters database release Jan 2010 ( The data set contained 717455 proteins from 593 genomes. Multiple alignments were constructed by Muscle . Protein phylogenetic trees were created using the protdist and neighbor programs in the PHYLIP package . Signal peptide scores were calculated by SingalP 3.0-NN . In the evolutionary analysis, we considered a subset of orthologous clusters where different discrete predictions of signal peptides were present. […]

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