In general, recombinant techniques involve isolating the genes responsible for coding growth factor, cloning the gene in suitable vectors and cell types, modifying the gene if necessary to encode a desired variant, and expressing the gene in {HEAD ~ order} to produce {TAIL ~ the growth factor protein product} 
to produce
In general , recombinant techniques involve isolating the genes responsible for coding growth factor , cloning the gene in suitable vectors and cell types , modifying the gene if necessary to encode a desired variant , and expressing the gene in { HEAD ~ order } to produce { TAIL ~ the growth factor protein product }
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