Comparative protein clustering and GO annotation. A. Venn diagram showing the number of common and unique protein clusters for three Propionibacteria. The values in parentheses represent the number of protein clusters. The values in square brackets represent the number of single proteins (proteins not in clusters). The number of proteins clustered in each group are also indicated, not enclosed and color-coded by organism: values in green represent P. acidipropionici proteins, values in blue represent P. freudenreichii proteins and values in red represent P. acnes proteins. B. Pie chart depicting the result of GO annotation of proteins unique to P. acidipropionici. C. Multi-level pie chart detailing GO annotation of proteins unique to P. acidipropionici. Inner circle represent level 3 terms. Outer circle represent lower level (more specific) terms.