Alternatively, {HEAD ~ a nucleotide sequence} encoding {TAIL ~ the desired growth factor protein product} may be chemically synthesized 
encoding
Alternatively , { HEAD ~ a nucleotide sequence } encoding { TAIL ~ the desired growth factor protein product } may be chemically synthesized
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH