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