Percentage of N. apis predicted genes as annotated proteins, hypothetical proteins, proteins without annotation and proteins without blast hit. Annotated proteins share similarity with GO-annotated proteins. Unannotated proteins do not share sufficient similarity with GO- annotated proteins. Hypothetical proteins share similarity with previously published proteins of unknown function. Unclassified proteins have no sequence similarity with any sequence in public databases. The percentage for each group is given in parentheses. The annotated proteins were further classified into three GO categories: biological process, molecular function, and cellular component (Level 2). The y-axis indicates the percentage of a specific category of genes within the main categories.