Number of T4SSs that are from experimental literatures
Number of T4Ses that are from experimental literatures
Number of structure of T4SSs components
Number of accessory proteins of T4SSs for substrate-channel docking.
Number of information on host-pathogen interaction.
* Number of effecters that can be delivered by T4SS(s) encoded by the replicon. In some cases, effectors are not encoded by the same replicon that coding for T4SS.