These vaccines are produced with {HEAD ~ portions} of {TAIL ~ C.} difficile Toxin A, or Toxin B, or both 
These vaccines are produced with { HEAD ~ portions } of { TAIL ~ C. } difficile Toxin A , or Toxin B , or both
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH