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The 700 character space often includes some of : activity description, motivation for involvement, your role, skills gained.What usually goes in a 700 character Activity box vs the 1325 character Most Meaningful essay area?
The 1325 character space might be for anecdotes, impact, insights gained, qualities demonstrated that are desirable in a future physician, future direction.
Note that all these items are not relevant to all activities, so pick and choose what will best leave the impression you wish to give.