I have been gathering papers that document homology or inessentiality for flagellum proteins.    From Wordnik.com.  [Alert! Alack! I have been quote mined! - The Panda's Thumb] Reference

The number can go down by new observations, but it can only go up if a currently-published observation of inessentiality turns out to be plain wrong, which is unlikely.    From Wordnik.com.  [Casey Luskin's self-flagellation - The Panda's Thumb] Reference