Oxygen*

To have or not to have - That is the question:

Whether 'tis nobler in the cell to suffer the itch of radical and reactive species, or to take glucose in anaerobiosis and by fermenting end it. To ferment: to respire no more; and by ferment to say we end the mitochondrial-ache and the thousand natural shocks that O2 is heir to. To make perchance more ATP, 'tis a consumation devoutly to be wish'd. To ferment, to respire. To ferment, though not divide; ay, There's the rub.

*Si Shakespeare hubiera sido químico, tal vez hubiera escrito algo así.