found in Lyme disease spirochetes; MW 22.7 kDa; amino acid sequence has been determined; do not confuse with the lipid OSPC; GenBank X69596, U01894 & D49497 ( Borrelia burgdorferi), L24911 (vmp33), U93699 (Borrelia garinii), AB009891& AB009896 (Borrelia afzelii)