For example, general, well defined promoter sequences of chicken β actin and C. elegans {HEAD ~ ribosomal genes} have successfully directed {TAIL ~ expression} of GFP in hydra  
directed
For example , general , well defined promoter sequences of chicken β actin and C. elegans { HEAD ~ ribosomal genes } have successfully directed { TAIL ~ expression } of GFP in hydra
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH