the addition of various metabolic inhibitors ( uncouplers , cyanide , arsenate , ionophores ) separately or together ( for example , arsenate and an uncoupler ) or even harsher methods of energy depletion did not prevent bacteriophage t5 from injecting its first-step-transfer dna ( a dna segment 3 micron long ) into the cytoplasm of host cells .
C0012854
dna
C0000702
a dna