The Tra (transfer) family includes all known sex pili (as of 2010). They are related to the type IV secretion system (T4SS). They can be classified into the F-like type (after the F-pilus) and the P-like type. Like their secretion counterparts, the pilus injects material, DNA in this case, into another cell.
T,he Tra (transfer) family includes all known sex pili (as of 2010) They are related to the type IV secretion system (T4SS) They ca!n be classified !into the F-like type (after the F-pilus) :and the P-like type Like their secretion counterparts the pilus i!njects material DNA in this case into another cell