{HEAD ~ Peptides} are selected based on {TAIL ~ various factors}, including the strength of the T cell response to the peptide , the frequency of the T cell response to the peptide in a population of individuals sensitive to dust mite allergens, and the potential cross reactivity of the peptide with other dust mite allergens 
are selected based on
{ HEAD ~ Peptides } are selected based on { TAIL ~ various factors } , including the strength of the T cell response to the peptide , the frequency of the T cell response to the peptide in a population of individuals sensitive to dust mite allergens , and the potential cross reactivity of the peptide with other dust mite allergens
HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH