The flagellar hook-associated protein 2 (HAP2 or FliD) forms the distal end of the flagella, and plays a role in mucin specific adhesion of the bacteria [2]. This alignment covers the N-terminal region of this family of proteins.

1: The Bacillus subtilis sigma D-dependent operon encoding the flagellar proteins FliD, FliS, and FliT. Chen L, Helmann JD; J Bacteriol 1994;176:3093-3101. PMID:8195064

2: The Pseudomonas aeruginosa flagellar cap protein, FliD, is responsible for mucin adhesion. Arora SK, Ritchings BW, Almira EC, Lory S, Ramphal R; Infect Immun 1998;66:1000-1007. PMID:9488388