Although {TAIL ~ all cases} for ODC activity increases are unknown, it is known that 12 O tetradecanoylphorbol 13 acetate induces {HEAD ~ ODC activity} 
Although { TAIL ~ all cases } for ODC activity increases are unknown , it is known that 12 O tetradecanoylphorbol 13 acetate induces { HEAD ~ ODC activity }
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD