That execution outside of the cell in which it is produced
is Enzymes it degrade large molecules into units that are little enough to be
pass through across the cell membrane and into the cell where they can be very
useful.
Whether or not the article describes persenal experience is the major determining factor in this question. If the article tells the story of another, it is secondary, if the article was written by someone who is recounting on their experience, it is first peron. Hope this is clear and understandable.